51007745656 has 64 divisors (see below), whose sum is σ = 115230689280. Its totient is φ = 20694389760.

The previous prime is 51007745641. The next prime is 51007745683. The reversal of 51007745656 is 65654770015.

It is a happy number.

51007745656 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (46).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 79200 + ... + 329071.

It is an arithmetic number, because the mean of its divisors is an integer number (1800479520).

Almost surely, 2^51007745656 is an apocalyptic number.

51007745656 is a gapful number since it is divisible by the number (56) formed by its first and last digit.

It is an amenable number.

51007745656 is an abundant number, since it is smaller than the sum of its proper divisors (64222943624).

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

51007745656 is a wasteful number, since it uses less digits than its factorization.

51007745656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 408404 (or 408400 counting only the distinct ones).

The product of its (nonzero) digits is 882000, while the sum is 46.

The spelling of 51007745656 in words is "fifty-one billion, seven million, seven hundred forty-five thousand, six hundred fifty-six".