51600821955 has 16 divisors (see below), whose sum is σ = 82564168704. Its totient is φ = 27519487200.

The previous prime is 51600821947. The next prime is 51600821957. The reversal of 51600821955 is 55912800615.

It is a happy number.

It is not a de Polignac number, because 51600821955 - 2³ = 51600821947 is a prime.

It is a super-2 number, since 2×51600821955² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (51600821957) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 711630 + ... + 780780.

It is an arithmetic number, because the mean of its divisors is an integer number (5160260544).

Almost surely, 2^51600821955 is an apocalyptic number.

51600821955 is a deficient number, since it is larger than the sum of its proper divisors (30963346749).

51600821955 is a wasteful number, since it uses less digits than its factorization.

51600821955 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 118906.

The product of its (nonzero) digits is 108000, while the sum is 42.

The spelling of 51600821955 in words is "fifty-one billion, six hundred million, eight hundred twenty-one thousand, nine hundred fifty-five".