53644697858 has 8 divisors (see below), whose sum is σ = 80741679228. Its totient is φ = 26730804784.

The previous prime is 53644697851. The next prime is 53644698001. The reversal of 53644697858 is 85879644635.

It can be written as a sum of positive squares in 2 ways, for example, as 45930061969 + 7714635889 = 214313^2 + 87833^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×53644697858² (a number of 22 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 53644697794 and 53644697803.

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, 45771341 + ... + 45772512.

Almost surely, 2^53644697858 is an apocalyptic number.

53644697858 is a deficient number, since it is larger than the sum of its proper divisors (27096981370).

53644697858 is a wasteful number, since it uses less digits than its factorization.

53644697858 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 91544148.

The product of its digits is 174182400, while the sum is 65.

The spelling of 53644697858 in words is "fifty-three billion, six hundred forty-four million, six hundred ninety-seven thousand, eight hundred fifty-eight".