81037670048 has 24 divisors (see below), whose sum is σ = 159569755380. Its totient is φ = 40512017920.

The previous prime is 81037670041. The next prime is 81037670081. The reversal of 81037670048 is 84007673018.

It can be written as a sum of positive squares in 2 ways, for example, as 74622941584 + 6414728464 = 273172^2 + 80092^2 .

It is a junction number, because it is equal to n+sod(n) for n = 81037669990 and 81037670008.

It is not an unprimeable number, because it can be changed into a prime (81037670041) 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, 17093 + ... + 402948.

Almost surely, 2^81037670048 is an apocalyptic number.

It is an amenable number.

81037670048 is a deficient number, since it is larger than the sum of its proper divisors (78532085332).

81037670048 is a wasteful number, since it uses less digits than its factorization.

81037670048 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 426080 (or 426072 counting only the distinct ones).

The product of its (nonzero) digits is 225792, while the sum is 44.

The spelling of 81037670048 in words is "eighty-one billion, thirty-seven million, six hundred seventy thousand, forty-eight".