253436508861 has 16 divisors (see below), whose sum is σ = 359057024064. Its totient is φ = 158457072384.

The previous prime is 253436508859. The next prime is 253436508877. The reversal of 253436508861 is 168805634352.

It is not a de Polignac number, because 253436508861 - 2¹ = 253436508859 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (253436508851) 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 15 ways as a sum of consecutive naturals, for example, 8765326 + ... + 8794191.

It is an arithmetic number, because the mean of its divisors is an integer number (22441064004).

Almost surely, 2^253436508861 is an apocalyptic number.

It is an amenable number.

253436508861 is a deficient number, since it is larger than the sum of its proper divisors (105620515203).

253436508861 is a wasteful number, since it uses less digits than its factorization.

253436508861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17559820.

The product of its (nonzero) digits is 4147200, while the sum is 51.

The spelling of 253436508861 in words is "two hundred fifty-three billion, four hundred thirty-six million, five hundred eight thousand, eight hundred sixty-one".