81077313272 has 16 divisors (see below), whose sum is σ = 153728053200. Its totient is φ = 40083165760.

The previous prime is 81077313221. The next prime is 81077313277. The reversal of 81077313272 is 27231377018.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81077313277) 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 3 ways as a sum of consecutive naturals, for example, 56935604 + ... + 56937027.

It is an arithmetic number, because the mean of its divisors is an integer number (9608003325).

Almost surely, 2^81077313272 is an apocalyptic number.

It is an amenable number.

81077313272 is a deficient number, since it is larger than the sum of its proper divisors (72650739928).

81077313272 is a wasteful number, since it uses less digits than its factorization.

81077313272 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 113872726 (or 113872722 counting only the distinct ones).

The product of its (nonzero) digits is 98784, while the sum is 41.

The spelling of 81077313272 in words is "eighty-one billion, seventy-seven million, three hundred thirteen thousand, two hundred seventy-two".