1216566402 has 16 divisors (see below), whose sum is σ = 2435546880. Its totient is φ = 405119792.

The previous prime is 1216566383. The next prime is 1216566413. The reversal of 1216566402 is 2046656121.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 94002 + ... + 106157.

It is an arithmetic number, because the mean of its divisors is an integer number (152221680).

Almost surely, 2^1216566402 is an apocalyptic number.

1216566402 is an abundant number, since it is smaller than the sum of its proper divisors (1218980478).

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

1216566402 is a wasteful number, since it uses less digits than its factorization.

1216566402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 201177.

The product of its (nonzero) digits is 17280, while the sum is 33.

The square root of 1216566402 is about 34879.3119484889. The cubic root of 1216566402 is about 1067.5263561365.

The spelling of 1216566402 in words is "one billion, two hundred sixteen million, five hundred sixty-six thousand, four hundred two".