51395691072 has 448 divisors, whose sum is σ = 160115097600. Its totient is φ = 14395729920.

The previous prime is 51395691059. The next prime is 51395691079. The reversal of 51395691072 is 27019659315.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is not an unprimeable number, because it can be changed into a prime (51395691079) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 226412623 + ... + 226412849.

Almost surely, 2^51395691072 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51395691072, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (80057548800).

51395691072 is an abundant number, since it is smaller than the sum of its proper divisors (108719406528).

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

51395691072 is a wasteful number, since it uses less digits than its factorization.

51395691072 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 414 (or 404 counting only the distinct ones).

The product of its (nonzero) digits is 510300, while the sum is 48.

The spelling of 51395691072 in words is "fifty-one billion, three hundred ninety-five million, six hundred ninety-one thousand, seventy-two".