81200908867 has 24 divisors (see below), whose sum is σ = 95890374272. Its totient is φ = 68269824000.

The previous prime is 81200908853. The next prime is 81200908871. The reversal of 81200908867 is 76880900218.

It is a de Polignac number, because none of the positive numbers 2^k-81200908867 is a prime.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 81200908867.

It is not an unprimeable number, because it can be changed into a prime (81200908897) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 232134 + ... + 465067.

Almost surely, 2^81200908867 is an apocalyptic number.

81200908867 is a deficient number, since it is larger than the sum of its proper divisors (14689465405).

81200908867 is a wasteful number, since it uses less digits than its factorization.

81200908867 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 697279 (or 697262 counting only the distinct ones).

The product of its (nonzero) digits is 387072, while the sum is 49.

The spelling of 81200908867 in words is "eighty-one billion, two hundred million, nine hundred eight thousand, eight hundred sixty-seven".