51660616 has 16 divisors (see below), whose sum is σ = 110701440. Its totient is φ = 22140240.

The previous prime is 51660613. The next prime is 51660617. The reversal of 51660616 is 61606615.

It is not an unprimeable number, because it can be changed into a prime (51660613) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 461200 + ... + 461311.

It is an arithmetic number, because the mean of its divisors is an integer number (6918840).

Almost surely, 2^51660616 is an apocalyptic number.

51660616 is a gapful number since it is divisible by the number (56) formed by its first and last digit.

It is an amenable number.

51660616 is an abundant number, since it is smaller than the sum of its proper divisors (59040824).

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

51660616 is a wasteful number, since it uses less digits than its factorization.

51660616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 922524 (or 922520 counting only the distinct ones).

The product of its (nonzero) digits is 6480, while the sum is 31.

The square root of 51660616 is about 7187.5319825375. The cubic root of 51660616 is about 372.4373205048.

The spelling of 51660616 in words is "fifty-one million, six hundred sixty thousand, six hundred sixteen".