51721870553700 has 72 divisors (see below), whose sum is σ = 149654266805568. Its totient is φ = 13791977646720.

The previous prime is 51721870553693. The next prime is 51721870553701. The reversal of 51721870553700 is 735507812715.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (51721870553701) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4727889 + ... + 11215911.

Almost surely, 2^{51721870553700} is an apocalyptic number.

51721870553700 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

It is an amenable number.

51721870553700 is an abundant number, since it is smaller than the sum of its proper divisors (97932396251868).

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

51721870553700 is a wasteful number, since it uses less digits than its factorization.

51721870553700 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6514613 (or 6514606 counting only the distinct ones).

The product of its (nonzero) digits is 2058000, while the sum is 51.

The spelling of 51721870553700 in words is "fifty-one trillion, seven hundred twenty-one billion, eight hundred seventy million, five hundred fifty-three thousand, seven hundred".