51665501616000 has 128 divisors (see below), whose sum is σ = 171271138016160. Its totient is φ = 13777467084800.

The previous prime is 51665501615993. The next prime is 51665501616007. The reversal of 51665501616000 is 61610556615.

It is an interprime number because it is at equal distance from previous prime (51665501615993) and next prime (51665501616007).

It is a tau number, because it is divible by the number of its divisors (128).

It is a super-2 number, since 2×51665501616000² (a number of 28 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51665501616007) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 538134309 + ... + 538230308.

Almost surely, 2^{51665501616000} is an apocalyptic number.

51665501616000 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

It is an amenable number.

51665501616000 is an abundant number, since it is smaller than the sum of its proper divisors (119605636400160).

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

51665501616000 is a wasteful number, since it uses less digits than its factorization.

51665501616000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1076364649 (or 1076364627 counting only the distinct ones).

The product of its (nonzero) digits is 162000, while the sum is 42.

The spelling of 51665501616000 in words is "fifty-one trillion, six hundred sixty-five billion, five hundred one million, six hundred sixteen thousand".