253515723451 has 4 divisors (see below), whose sum is σ = 253581116992. Its totient is φ = 253450329912.

The previous prime is 253515723449. The next prime is 253515723463. The reversal of 253515723451 is 154327515352.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 253515723451 - 2¹ = 253515723449 is a prime.

It is a super-2 number, since 2×253515723451² (a number of 24 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 = 253515723398 and 253515723407.

It is not an unprimeable number, because it can be changed into a prime (253515723431) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 32690955 + ... + 32698708.

It is an arithmetic number, because the mean of its divisors is an integer number (63395279248).

Almost surely, 2^253515723451 is an apocalyptic number.

253515723451 is a deficient number, since it is larger than the sum of its proper divisors (65393541).

253515723451 is an equidigital number, since it uses as much as digits as its factorization.

253515723451 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65393540.

The product of its digits is 630000, while the sum is 43.

The spelling of 253515723451 in words is "two hundred fifty-three billion, five hundred fifteen million, seven hundred twenty-three thousand, four hundred fifty-one".