51306652661 has 8 divisors (see below), whose sum is σ = 56032614624. Its totient is φ = 46590977520.

The previous prime is 51306652643. The next prime is 51306652729. The reversal of 51306652661 is 16625660315.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 51306652661 - 2¹⁰ = 51306651637 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 (51306652861) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2561270 + ... + 2581223.

It is an arithmetic number, because the mean of its divisors is an integer number (7004076828).

Almost surely, 2^51306652661 is an apocalyptic number.

It is an amenable number.

51306652661 is a deficient number, since it is larger than the sum of its proper divisors (4725961963).

51306652661 is a wasteful number, since it uses less digits than its factorization.

51306652661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5143411.

The product of its (nonzero) digits is 194400, while the sum is 41.

The spelling of 51306652661 in words is "fifty-one billion, three hundred six million, six hundred fifty-two thousand, six hundred sixty-one".