81369737200 has 60 divisors (see below), whose sum is σ = 195520608648. Its totient is φ = 32542931200.

The previous prime is 81369737177. The next prime is 81369737237. The reversal of 81369737200 is 273796318.

It is a happy number.

It is a Smith number, since the sum of its digits (46) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3754395 + ... + 3776005.

Almost surely, 2^81369737200 is an apocalyptic number.

81369737200 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

81369737200 is an abundant number, since it is smaller than the sum of its proper divisors (114150871448).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

81369737200 is a wasteful number, since it uses less digits than its factorization.

81369737200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31042 (or 31031 counting only the distinct ones).

The product of its (nonzero) digits is 381024, while the sum is 46.

The spelling of 81369737200 in words is "eighty-one billion, three hundred sixty-nine million, seven hundred thirty-seven thousand, two hundred".