81553060332 has 48 divisors (see below), whose sum is σ = 212219935200. Its totient is φ = 27083286720.

The previous prime is 81553060321. The next prime is 81553060333. The reversal of 81553060332 is 23306035518.

81553060332 is a `hidden beast` number, since 8 + 15 + 5 + 3 + 0 + 603 + 32 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (81553060333) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1374519 + ... + 1432622.

It is an arithmetic number, because the mean of its divisors is an integer number (4421248650).

Almost surely, 2^81553060332 is an apocalyptic number.

It is an amenable number.

81553060332 is an abundant number, since it is smaller than the sum of its proper divisors (130666874868).

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

81553060332 is a wasteful number, since it uses less digits than its factorization.

81553060332 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2807423 (or 2807415 counting only the distinct ones).

The product of its (nonzero) digits is 64800, while the sum is 36.

The spelling of 81553060332 in words is "eighty-one billion, five hundred fifty-three million, sixty thousand, three hundred thirty-two".