80651556 has 18 divisors (see below), whose sum is σ = 203869302. Its totient is φ = 26883840.

The previous prime is 80651539. The next prime is 80651563. The reversal of 80651556 is 65515608.

It can be written as a sum of positive squares in only one way, i.e., 47196900 + 33454656 = 6870^2 + 5784^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a super-2 number, since 2×80651556² = 13009346970442272, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36), and also a Moran number because the ratio is a prime number: 2240321 = 80651556 / (8 + 0 + 6 + 5 + 1 + 5 + 5 + 6).

It is a self number, because there is not a number n which added to its sum of digits gives 80651556.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1120125 + ... + 1120196.

Almost surely, 2^80651556 is an apocalyptic number.

It is an amenable number.

80651556 is an abundant number, since it is smaller than the sum of its proper divisors (123217746).

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

80651556 is a wasteful number, since it uses less digits than its factorization.

80651556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2240331 (or 2240326 counting only the distinct ones).

The product of its (nonzero) digits is 36000, while the sum is 36.

The square root of 80651556 is about 8980.6211366475. The cubic root of 80651556 is about 432.0535556032.

The spelling of 80651556 in words is "eighty million, six hundred fifty-one thousand, five hundred fifty-six".