253983474785881 has 3 divisors (see below), whose sum is σ = 253983490722741. Its totient is φ = 253983458849022.

The previous prime is 253983474785857. The next prime is 253983474785993. The reversal of 253983474785881 is 188587474389352.

The square root of 253983474785881 is 15936859.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is not a de Polignac number, because 253983474785881 - 2¹⁷ = 253983474654809 is a prime.

It is a super-2 number, since 2×253983474785881² (a number of 30 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 253983474785795 and 253983474785804.

It is not an unprimeable number, because it can be changed into a prime (253983474785851) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 7968430 + ... + 23905288.

It is an arithmetic number, because the mean of its divisors is an integer number (84661163574247).

Almost surely, 2^{253983474785881} is an apocalyptic number.

253983474785881 is the 15936859-th square number.

253983474785881 is the 7968430-th centered octagonal number.

It is an amenable number.

253983474785881 is a deficient number, since it is larger than the sum of its proper divisors (15936860).

253983474785881 is an frugal number, since it uses more digits than its factorization.

253983474785881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31873718 (or 15936859 counting only the distinct ones).

The product of its digits is 13005619200, while the sum is 82.

The spelling of 253983474785881 in words is "two hundred fifty-three trillion, nine hundred eighty-three billion, four hundred seventy-four million, seven hundred eighty-five thousand, eight hundred eighty-one".