215065660 has 24 divisors (see below), whose sum is σ = 453672576. Its totient is φ = 85638720.

The previous prime is 215065651. The next prime is 215065667. The reversal of 215065660 is 66560512.

It is a super-2 number, since 2×215065660² = 92506476222471200, which contains 22 as substring.

It is a hoax number, since the sum of its digits (31) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (215065667) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19651 + ... + 28570.

It is an arithmetic number, because the mean of its divisors is an integer number (18903024).

Almost surely, 2^215065660 is an apocalyptic number.

215065660 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

215065660 is an abundant number, since it is smaller than the sum of its proper divisors (238606916).

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

215065660 is a wasteful number, since it uses less digits than its factorization.

215065660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48453 (or 48451 counting only the distinct ones).

The product of its (nonzero) digits is 10800, while the sum is 31.

The square root of 215065660 is about 14665.1171151137. The cubic root of 215065660 is about 599.1336199485.

The spelling of 215065660 in words is "two hundred fifteen million, sixty-five thousand, six hundred sixty".