51481596966661 has 32 divisors (see below), whose sum is σ = 56835279244800. Its totient is φ = 46413173560320.

The previous prime is 51481596966629. The next prime is 51481596966673. The reversal of 51481596966661 is 16666969518415.

It is a cyclic number.

It is not a de Polignac number, because 51481596966661 - 2⁵ = 51481596966629 is a prime.

It is a super-3 number, since 3×51481596966661³ (a number of 42 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51481596966161) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 97249951 + ... + 97777891.

It is an arithmetic number, because the mean of its divisors is an integer number (1776102476400).

Almost surely, 2^{51481596966661} is an apocalyptic number.

It is an amenable number.

51481596966661 is a deficient number, since it is larger than the sum of its proper divisors (5353682278139).

51481596966661 is a wasteful number, since it uses less digits than its factorization.

51481596966661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 529549.

The product of its digits is 503884800, while the sum is 73.

The spelling of 51481596966661 in words is "fifty-one trillion, four hundred eighty-one billion, five hundred ninety-six million, nine hundred sixty-six thousand, six hundred sixty-one".