51661016615 has 16 divisors (see below), whose sum is σ = 66851846208. Its totient is φ = 38098292736.

The previous prime is 51661016581. The next prime is 51661016633.

51661016615 is nontrivially palindromic in base 10.

It is a cyclic number.

It is not a de Polignac number, because 51661016615 - 2¹⁶ = 51660951079 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 486554 + ... + 583143.

It is an arithmetic number, because the mean of its divisors is an integer number (4178240388).

Almost surely, 2^51661016615 is an apocalyptic number.

51661016615 is a deficient number, since it is larger than the sum of its proper divisors (15190829593).

51661016615 is a wasteful number, since it uses less digits than its factorization.

51661016615 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1070458.

The product of its (nonzero) digits is 32400, while the sum is 38.

The spelling of 51661016615 in words is "fifty-one billion, six hundred sixty-one million, sixteen thousand, six hundred fifteen".