51516551010661 has 16 divisors (see below), whose sum is σ = 56297132236800. Its totient is φ = 46752244945200.

The previous prime is 51516551010629. The next prime is 51516551010671. The reversal of 51516551010661 is 16601015561515.

It is a cyclic number.

It is not a de Polignac number, because 51516551010661 - 2⁵ = 51516551010629 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51516551010671) 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, 14125516 + ... + 17394346.

It is an arithmetic number, because the mean of its divisors is an integer number (3518570764800).

Almost surely, 2^{51516551010661} is an apocalyptic number.

It is an amenable number.

51516551010661 is a deficient number, since it is larger than the sum of its proper divisors (4780581226139).

51516551010661 is a wasteful number, since it uses less digits than its factorization.

51516551010661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3271320.

The product of its (nonzero) digits is 135000, while the sum is 43.

The spelling of 51516551010661 in words is "fifty-one trillion, five hundred sixteen billion, five hundred fifty-one million, ten thousand, six hundred sixty-one".