80651645 has 4 divisors (see below), whose sum is σ = 96781980. Its totient is φ = 64521312.

The previous prime is 80651611. The next prime is 80651657. The reversal of 80651645 is 54615608.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 15784729 + 64866916 = 3973^2 + 8054^2 .

It is a cyclic number.

It is not a de Polignac number, because 80651645 - 2¹⁸ = 80389501 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8065160 + ... + 8065169.

It is an arithmetic number, because the mean of its divisors is an integer number (24195495).

Almost surely, 2^80651645 is an apocalyptic number.

It is an amenable number.

80651645 is a deficient number, since it is larger than the sum of its proper divisors (16130335).

80651645 is a wasteful number, since it uses less digits than its factorization.

80651645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16130334.

The product of its (nonzero) digits is 28800, while the sum is 35.

The square root of 80651645 is about 8980.6260917600. The cubic root of 80651645 is about 432.0537145286.

The spelling of 80651645 in words is "eighty million, six hundred fifty-one thousand, six hundred forty-five".