16215820465 has 32 divisors (see below), whose sum is σ = 22169952000. Its totient is φ = 11287330560.

The previous prime is 16215820463. The next prime is 16215820469. The reversal of 16215820465 is 56402851261.

It is not a de Polignac number, because 16215820465 - 2¹ = 16215820463 is a prime.

It is a super-2 number, since 2×16215820465² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (16215820463) 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, 212775 + ... + 278755.

It is an arithmetic number, because the mean of its divisors is an integer number (692811000).

Almost surely, 2^16215820465 is an apocalyptic number.

It is an amenable number.

16215820465 is a deficient number, since it is larger than the sum of its proper divisors (5954131535).

16215820465 is a wasteful number, since it uses less digits than its factorization.

16215820465 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66217.

The product of its (nonzero) digits is 115200, while the sum is 40.

The spelling of 16215820465 in words is "sixteen billion, two hundred fifteen million, eight hundred twenty thousand, four hundred sixty-five".