80643651 has 8 divisors (see below), whose sum is σ = 117299904. Its totient is φ = 48874920.

The previous prime is 80643643. The next prime is 80643659. The reversal of 80643651 is 15634608.

It is an interprime number because it is at equal distance from previous prime (80643643) and next prime (80643659).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 80643651 - 2³ = 80643643 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33), and also a Moran number because the ratio is a prime number: 2443747 = 80643651 / (8 + 0 + 6 + 4 + 3 + 6 + 5 + 1).

It is not an unprimeable number, because it can be changed into a prime (80643659) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1221841 + ... + 1221906.

It is an arithmetic number, because the mean of its divisors is an integer number (14662488).

Almost surely, 2^80643651 is an apocalyptic number.

80643651 is a deficient number, since it is larger than the sum of its proper divisors (36656253).

80643651 is a wasteful number, since it uses less digits than its factorization.

80643651 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2443761.

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

The square root of 80643651 is about 8980.1810115387. The cubic root of 80643651 is about 432.0394393434.

The spelling of 80643651 in words is "eighty million, six hundred forty-three thousand, six hundred fifty-one".