80855721 has 12 divisors (see below), whose sum is σ = 117926848. Its totient is φ = 53379864.

The previous prime is 80855713. The next prime is 80855729. The reversal of 80855721 is 12755808.

80855721 is a `hidden beast` number, since 8 + 0 + 85 + 572 + 1 = 666.

It is an interprime number because it is at equal distance from previous prime (80855713) and next prime (80855729).

It is not a de Polignac number, because 80855721 - 2³ = 80855713 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (80855729) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 42685 + ... + 44538.

Almost surely, 2^80855721 is an apocalyptic number.

It is an amenable number.

80855721 is a deficient number, since it is larger than the sum of its proper divisors (37071127).

80855721 is a wasteful number, since it uses less digits than its factorization.

80855721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87332 (or 87329 counting only the distinct ones).

The product of its (nonzero) digits is 22400, while the sum is 36.

The square root of 80855721 is about 8991.9809274709. The cubic root of 80855721 is about 432.4178217126.

The spelling of 80855721 in words is "eighty million, eight hundred fifty-five thousand, seven hundred twenty-one".