2165656402 has 64 divisors (see below), whose sum is σ = 4219568640. Its totient is φ = 810146304.

The previous prime is 2165656399. The next prime is 2165656483. The reversal of 2165656402 is 2046565612.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 369648 + ... + 375460.

It is an arithmetic number, because the mean of its divisors is an integer number (65930760).

Almost surely, 2^2165656402 is an apocalyptic number.

2165656402 is a deficient number, since it is larger than the sum of its proper divisors (2053912238).

2165656402 is a wasteful number, since it uses less digits than its factorization.

2165656402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5947.

The product of its (nonzero) digits is 86400, while the sum is 37.

The square root of 2165656402 is about 46536.6135639455. The cubic root of 2165656402 is about 1293.7881961169.

It can be divided in two parts, 2 and 165656402, that multiplied together give a square (331312804 = 18202²).

The spelling of 2165656402 in words is "two billion, one hundred sixty-five million, six hundred fifty-six thousand, four hundred two".