53644697857 has 4 divisors (see below), whose sum is σ = 53703071680. Its totient is φ = 53586324036.

The previous prime is 53644697851. The next prime is 53644698001. The reversal of 53644697857 is 75879644635.

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, and also an emirpimes, since its reverse is a distinct semiprime: 75879644635 = 5 ⋅15175928927.

It is a cyclic number.

It is not a de Polignac number, because 53644697857 - 2³ = 53644697849 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (53644697851) 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, 29185533 + ... + 29187370.

It is an arithmetic number, because the mean of its divisors is an integer number (13425767920).

Almost surely, 2^53644697857 is an apocalyptic number.

It is an amenable number.

53644697857 is a deficient number, since it is larger than the sum of its proper divisors (58373823).

53644697857 is an equidigital number, since it uses as much as digits as its factorization.

53644697857 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58373822.

The product of its digits is 152409600, while the sum is 64.

The spelling of 53644697857 in words is "fifty-three billion, six hundred forty-four million, six hundred ninety-seven thousand, eight hundred fifty-seven".