81120964623 has 16 divisors (see below), whose sum is σ = 110685527040. Its totient is φ = 52818724224.

The previous prime is 81120964601. The next prime is 81120964627. The reversal of 81120964623 is 32646902118.

It is not a de Polignac number, because 81120964623 - 2⁵ = 81120964591 is a prime.

It is a super-2 number, since 2×81120964623² (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 (81120964627) 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 15 ways as a sum of consecutive naturals, for example, 2945943 + ... + 2973351.

It is an arithmetic number, because the mean of its divisors is an integer number (6917845440).

Almost surely, 2^81120964623 is an apocalyptic number.

81120964623 is a deficient number, since it is larger than the sum of its proper divisors (29564562417).

81120964623 is a wasteful number, since it uses less digits than its factorization.

81120964623 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50398.

The product of its (nonzero) digits is 124416, while the sum is 42.

The spelling of 81120964623 in words is "eighty-one billion, one hundred twenty million, nine hundred sixty-four thousand, six hundred twenty-three".