80636779731 has 8 divisors (see below), whose sum is σ = 107517018064. Its totient is φ = 53757197280.

The previous prime is 80636779649. The next prime is 80636779787. The reversal of 80636779731 is 13797763608.

It is a happy number.

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

It is not a de Polignac number, because 80636779731 - 2⁹ = 80636779219 is a prime.

It is a super-2 number, since 2×80636779731² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (80636799731) 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, 400725 + ... + 567321.

It is an arithmetic number, because the mean of its divisors is an integer number (13439627258).

Almost surely, 2^80636779731 is an apocalyptic number.

80636779731 is a deficient number, since it is larger than the sum of its proper divisors (26880238333).

80636779731 is a wasteful number, since it uses less digits than its factorization.

80636779731 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 327941.

The product of its (nonzero) digits is 8001504, while the sum is 57.

The spelling of 80636779731 in words is "eighty billion, six hundred thirty-six million, seven hundred seventy-nine thousand, seven hundred thirty-one".