51257349720 has 64 divisors (see below), whose sum is σ = 170857836000. Its totient is φ = 13668626304.

The previous prime is 51257349677. The next prime is 51257349833. The reversal of 51257349720 is 2794375215.

It is a happy number.

51257349720 is a `hidden beast` number, since 5 + 1 + 2 + 573 + 4 + 9 + 72 + 0 = 666.

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (45).

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, 23729175 + ... + 23731334.

Almost surely, 2^51257349720 is an apocalyptic number.

It is an amenable number.

51257349720 is an abundant number, since it is smaller than the sum of its proper divisors (119600486280).

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

51257349720 is a wasteful number, since it uses less digits than its factorization.

51257349720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47460529 (or 47460519 counting only the distinct ones).

The product of its (nonzero) digits is 529200, while the sum is 45.

The spelling of 51257349720 in words is "fifty-one billion, two hundred fifty-seven million, three hundred forty-nine thousand, seven hundred twenty".