3215564865 has 32 divisors (see below), whose sum is σ = 5730912000. Its totient is φ = 1710662400.

The previous prime is 3215564861. The next prime is 3215564873. The reversal of 3215564865 is 5684655123.

3215564865 is a `hidden beast` number, since 3 + 2 + 1 + 5 + 564 + 86 + 5 = 666.

It is not a de Polignac number, because 3215564865 - 2² = 3215564861 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 3215564865.

It is not an unprimeable number, because it can be changed into a prime (3215564861) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 24436 + ... + 83834.

It is an arithmetic number, because the mean of its divisors is an integer number (179091000).

Almost surely, 2^3215564865 is an apocalyptic number.

It is an amenable number.

3215564865 is a deficient number, since it is larger than the sum of its proper divisors (2515347135).

3215564865 is a wasteful number, since it uses less digits than its factorization.

3215564865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 59814 (or 59808 counting only the distinct ones).

The product of its digits is 864000, while the sum is 45.

The square root of 3215564865 is about 56705.9508781927. The cubic root of 3215564865 is about 1475.9979633457.

It can be divided in two parts, 32155 and 64865, that added together give a triangular number (97020 = T₄₄₀).

The spelling of 3215564865 in words is "three billion, two hundred fifteen million, five hundred sixty-four thousand, eight hundred sixty-five".