80861844631 has 4 divisors (see below), whose sum is σ = 83470291264. Its totient is φ = 78253398000.

The previous prime is 80861844629. The next prime is 80861844643. The reversal of 80861844631 is 13644816808.

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

It is a cyclic number.

It is not a de Polignac number, because 80861844631 - 2¹ = 80861844629 is a prime.

It is a super-2 number, since 2×80861844631² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (80861841631) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1304223270 + ... + 1304223331.

It is an arithmetic number, because the mean of its divisors is an integer number (20867572816).

Almost surely, 2^80861844631 is an apocalyptic number.

80861844631 is a deficient number, since it is larger than the sum of its proper divisors (2608446633).

80861844631 is a wasteful number, since it uses less digits than its factorization.

80861844631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2608446632.

The product of its (nonzero) digits is 884736, while the sum is 49.

The spelling of 80861844631 in words is "eighty billion, eight hundred sixty-one million, eight hundred forty-four thousand, six hundred thirty-one".