51665600616 has 32 divisors (see below), whose sum is σ = 147616002240. Its totient is φ = 14761600128.

The previous prime is 51665600611. The next prime is 51665600621. The reversal of 51665600616 is 61600656615.

It is an interprime number because it is at equal distance from previous prime (51665600611) and next prime (51665600621).

It is a Harshad number since it is a multiple of its sum of digits (42).

It is not an unprimeable number, because it can be changed into a prime (51665600611) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 153766501 + ... + 153766836.

It is an arithmetic number, because the mean of its divisors is an integer number (4613000070).

Almost surely, 2^51665600616 is an apocalyptic number.

51665600616 is a gapful number since it is divisible by the number (56) formed by its first and last digit.

It is an amenable number.

51665600616 is an abundant number, since it is smaller than the sum of its proper divisors (95950401624).

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

51665600616 is a wasteful number, since it uses less digits than its factorization.

51665600616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 307533353 (or 307533349 counting only the distinct ones).

The product of its (nonzero) digits is 194400, while the sum is 42.

The spelling of 51665600616 in words is "fifty-one billion, six hundred sixty-five million, six hundred thousand, six hundred sixteen".