51240406956 has 96 divisors (see below), whose sum is σ = 127207584000. Its totient is φ = 16007539968.

The previous prime is 51240406949. The next prime is 51240406981. The reversal of 51240406956 is 65960404215.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 29981830 + ... + 29983538.

It is an arithmetic number, because the mean of its divisors is an integer number (1325079000).

Almost surely, 2^51240406956 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 51240406956, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (63603792000).

51240406956 is an abundant number, since it is smaller than the sum of its proper divisors (75967177044).

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

51240406956 is a wasteful number, since it uses less digits than its factorization.

51240406956 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3071 (or 3069 counting only the distinct ones).

The product of its (nonzero) digits is 259200, while the sum is 42.

The spelling of 51240406956 in words is "fifty-one billion, two hundred forty million, four hundred six thousand, nine hundred fifty-six".