51660206615 has 8 divisors (see below), whose sum is σ = 64129911840. Its totient is φ = 39903056032.

The previous prime is 51660206573. The next prime is 51660206627.

51660206615 is nontrivially palindromic in base 10.

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 51660206615 - 2¹² = 51660202519 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 178138499 + ... + 178138788.

It is an arithmetic number, because the mean of its divisors is an integer number (8016238980).

Almost surely, 2^51660206615 is an apocalyptic number.

51660206615 is a deficient number, since it is larger than the sum of its proper divisors (12469705225).

51660206615 is a wasteful number, since it uses less digits than its factorization.

51660206615 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 356277321.

The product of its (nonzero) digits is 64800, while the sum is 38.

The spelling of 51660206615 in words is "fifty-one billion, six hundred sixty million, two hundred six thousand, six hundred fifteen".