51155032272 has 40 divisors (see below), whose sum is σ = 132199797600. Its totient is φ = 17045316480.

The previous prime is 51155032249. The next prime is 51155032273. The reversal of 51155032272 is 27223055115.

51155032272 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×51155032272² (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 (51155032273) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 67879 + ... + 326982.

It is an arithmetic number, because the mean of its divisors is an integer number (3304994940).

Almost surely, 2^51155032272 is an apocalyptic number.

It is an amenable number.

51155032272 is an abundant number, since it is smaller than the sum of its proper divisors (81044765328).

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

51155032272 is a wasteful number, since it uses less digits than its factorization.

51155032272 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 397571 (or 397565 counting only the distinct ones).

The product of its (nonzero) digits is 21000, while the sum is 33.

Adding to 51155032272 its reverse (27223055115), we get a palindrome (78378087387).

The spelling of 51155032272 in words is "fifty-one billion, one hundred fifty-five million, thirty-two thousand, two hundred seventy-two".