51122220156 has 72 divisors (see below), whose sum is σ = 152450514944. Its totient is φ = 14135173920.

The previous prime is 51122220151. The next prime is 51122220181. The reversal of 51122220156 is 65102222115.

It is a super-2 number, since 2×51122220156² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51122220151) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3264220 + ... + 3279843.

Almost surely, 2^51122220156 is an apocalyptic number.

It is an amenable number.

51122220156 is an abundant number, since it is smaller than the sum of its proper divisors (101328294788).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

51122220156 is a wasteful number, since it uses less digits than its factorization.

51122220156 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6544111 (or 6544106 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 27.

The spelling of 51122220156 in words is "fifty-one billion, one hundred twenty-two million, two hundred twenty thousand, one hundred fifty-six".