51604635554 has 8 divisors (see below), whose sum is σ = 77408725548. Its totient is φ = 25801727040.

The previous prime is 51604635517. The next prime is 51604635559. The reversal of 51604635554 is 45553640615.

It can be written as a sum of positive squares in 2 ways, for example, as 48720408529 + 2884227025 = 220727^2 + 53705^2 .

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

It is a super-2 number, since 2×51604635554² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (51604635559) 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, 176627 + ... + 366614.

Almost surely, 2^51604635554 is an apocalyptic number.

51604635554 is a deficient number, since it is larger than the sum of its proper divisors (25804089994).

51604635554 is a wasteful number, since it uses less digits than its factorization.

51604635554 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 590740.

The product of its (nonzero) digits is 1080000, while the sum is 44.

The spelling of 51604635554 in words is "fifty-one billion, six hundred four million, six hundred thirty-five thousand, five hundred fifty-four".