81326700156 has 24 divisors (see below), whose sum is σ = 204359400784. Its totient is φ = 25023600000.

The previous prime is 81326700149. The next prime is 81326700157. The reversal of 81326700156 is 65100762318.

It is a super-2 number, since 2×81326700156² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81326700157) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 260662345 + ... + 260662656.

Almost surely, 2^81326700156 is an apocalyptic number.

It is an amenable number.

81326700156 is an abundant number, since it is smaller than the sum of its proper divisors (123032700628).

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

81326700156 is a wasteful number, since it uses less digits than its factorization.

81326700156 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 521325021 (or 521325019 counting only the distinct ones).

The product of its (nonzero) digits is 60480, while the sum is 39.

The spelling of 81326700156 in words is "eighty-one billion, three hundred twenty-six million, seven hundred thousand, one hundred fifty-six".