51361639560 has 384 divisors, whose sum is σ = 209848354560. Its totient is φ = 10671851520.

The previous prime is 51361639559. The next prime is 51361639603. The reversal of 51361639560 is 6593616315.

51361639560 is a `hidden beast` number, since 5 + 1 + 3 + 6 + 1 + 639 + 5 + 6 + 0 = 666.

51361639560 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 (45).

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 3346464 + ... + 3361776.

It is an arithmetic number, because the mean of its divisors is an integer number (546480090).

Almost surely, 2^51361639560 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 51361639560, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (104924177280).

51361639560 is an abundant number, since it is smaller than the sum of its proper divisors (158486715000).

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

51361639560 is a wasteful number, since it uses less digits than its factorization.

51361639560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15370 (or 15341 counting only the distinct ones).

The product of its (nonzero) digits is 437400, while the sum is 45.

The spelling of 51361639560 in words is "fifty-one billion, three hundred sixty-one million, six hundred thirty-nine thousand, five hundred sixty".