1658391216 has 40 divisors (see below), whose sum is σ = 4431911280. Its totient is φ = 533734656.

The previous prime is 1658391199. The next prime is 1658391223. The reversal of 1658391216 is 6121938561.

It is a super-2 number, since 2×1658391216² = 5500522850611917312, which contains 22 as substring.

It is an unprimeable number.

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, 594295 + ... + 597078.

It is an arithmetic number, because the mean of its divisors is an integer number (110797782).

Almost surely, 2^1658391216 is an apocalyptic number.

1658391216 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1658391216 is an abundant number, since it is smaller than the sum of its proper divisors (2773520064).

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

1658391216 is a wasteful number, since it uses less digits than its factorization.

1658391216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1191413 (or 1191407 counting only the distinct ones).

The product of its digits is 77760, while the sum is 42.

The square root of 1658391216 is about 40723.3497639868. The cubic root of 1658391216 is about 1183.6655183430.

The spelling of 1658391216 in words is "one billion, six hundred fifty-eight million, three hundred ninety-one thousand, two hundred sixteen".