51651665016 has 64 divisors (see below), whose sum is σ = 151008211200. Its totient is φ = 14414416128.

The previous prime is 51651665003. The next prime is 51651665017. The reversal of 51651665016 is 61056615615.

51651665016 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 (42).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51651665017) 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, 3567781 + ... + 3582228.

It is an arithmetic number, because the mean of its divisors is an integer number (2359503300).

Almost surely, 2^51651665016 is an apocalyptic number.

51651665016 is a gapful number since it is divisible by the number (56) formed by its first and last digit.

It is an amenable number.

51651665016 is an abundant number, since it is smaller than the sum of its proper divisors (99356546184).

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

51651665016 is a wasteful number, since it uses less digits than its factorization.

51651665016 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7150068 (or 7150064 counting only the distinct ones).

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

The spelling of 51651665016 in words is "fifty-one billion, six hundred fifty-one million, six hundred sixty-five thousand, sixteen".