51664017617 has 12 divisors (see below), whose sum is σ = 52201139760. Its totient is φ = 51132341232.

The previous prime is 51664017571. The next prime is 51664017619. The reversal of 51664017617 is 71671046615.

It is not a de Polignac number, because 51664017617 - 2²⁰ = 51662969041 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51664017619) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 13815734 + ... + 13819472.

It is an arithmetic number, because the mean of its divisors is an integer number (4350094980).

Almost surely, 2^51664017617 is an apocalyptic number.

It is an amenable number.

51664017617 is a deficient number, since it is larger than the sum of its proper divisors (537122143).

51664017617 is a wasteful number, since it uses less digits than its factorization.

51664017617 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5120 (or 5011 counting only the distinct ones).

The product of its (nonzero) digits is 211680, while the sum is 44.

The spelling of 51664017617 in words is "fifty-one billion, six hundred sixty-four million, seventeen thousand, six hundred seventeen".