80861864390 has 16 divisors (see below), whose sum is σ = 147304988208. Its totient is φ = 31955049696.

The previous prime is 80861864389. The next prime is 80861864399. The reversal of 80861864390 is 9346816808.

It is a super-2 number, since 2×80861864390² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (80861864399) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 48711137 + ... + 48712796.

It is an arithmetic number, because the mean of its divisors is an integer number (9206561763).

Almost surely, 2^80861864390 is an apocalyptic number.

80861864390 is a deficient number, since it is larger than the sum of its proper divisors (66443123818).

80861864390 is a wasteful number, since it uses less digits than its factorization.

80861864390 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 97424023.

The product of its (nonzero) digits is 1990656, while the sum is 53.

The spelling of 80861864390 in words is "eighty billion, eight hundred sixty-one million, eight hundred sixty-four thousand, three hundred ninety".