513856665 has 96 divisors (see below), whose sum is σ = 1060899840. Its totient is φ = 225203328.

The previous prime is 513856663. The next prime is 513856711. The reversal of 513856665 is 566658315.

It is not a de Polignac number, because 513856665 - 2¹ = 513856663 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 513856665.

It is not an unprimeable number, because it can be changed into a prime (513856663) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 798834 + ... + 799476.

It is an arithmetic number, because the mean of its divisors is an integer number (11051040).

Almost surely, 2^513856665 is an apocalyptic number.

It is an amenable number.

513856665 is an abundant number, since it is smaller than the sum of its proper divisors (547043175).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

513856665 is a wasteful number, since it uses less digits than its factorization.

513856665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 763 (or 760 counting only the distinct ones).

The product of its digits is 648000, while the sum is 45.

The square root of 513856665 is about 22668.4067591880. The cubic root of 513856665 is about 800.9658464773.

The spelling of 513856665 in words is "five hundred thirteen million, eight hundred fifty-six thousand, six hundred sixty-five".