51510001665 has 64 divisors (see below), whose sum is σ = 84830054400. Its totient is φ = 26681149440.

The previous prime is 51510001663. The next prime is 51510001681. The reversal of 51510001665 is 56610001515.

It is not a de Polignac number, because 51510001665 - 2¹ = 51510001663 is a prime.

It is not an unprimeable number, because it can be changed into a prime (51510001663) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 30316986 + ... + 30318684.

It is an arithmetic number, because the mean of its divisors is an integer number (1325469600).

Almost surely, 2^51510001665 is an apocalyptic number.

It is an amenable number.

51510001665 is a deficient number, since it is larger than the sum of its proper divisors (33320052735).

51510001665 is a wasteful number, since it uses less digits than its factorization.

51510001665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2182.

The product of its (nonzero) digits is 4500, while the sum is 30.

The spelling of 51510001665 in words is "fifty-one billion, five hundred ten million, one thousand, six hundred sixty-five".