253845826561 has 4 divisors (see below), whose sum is σ = 253907578624. Its totient is φ = 253784074500.

The previous prime is 253845826547. The next prime is 253845826579. The reversal of 253845826561 is 165628548352.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 253845826561 - 2⁵ = 253845826529 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (253846826561) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 30869865 + ... + 30878086.

It is an arithmetic number, because the mean of its divisors is an integer number (63476894656).

Almost surely, 2^253845826561 is an apocalyptic number.

It is an amenable number.

253845826561 is a deficient number, since it is larger than the sum of its proper divisors (61752063).

253845826561 is an equidigital number, since it uses as much as digits as its factorization.

253845826561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61752062.

The product of its digits is 13824000, while the sum is 55.

The spelling of 253845826561 in words is "two hundred fifty-three billion, eight hundred forty-five million, eight hundred twenty-six thousand, five hundred sixty-one".