81608150987902 has 256 divisors, whose sum is σ = 163025477314560. Its totient is φ = 29729181081600.

The previous prime is 81608150987897. The next prime is 81608150987903. The reversal of 81608150987902 is 20978905180618.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81608150987903) by changing a digit.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 2471983948 + ... + 2472016960.

It is an arithmetic number, because the mean of its divisors is an integer number (636818270760).

Almost surely, 2^{81608150987902} is an apocalyptic number.

81608150987902 is a gapful number since it is divisible by the number (82) formed by its first and last digit.

81608150987902 is a deficient number, since it is larger than the sum of its proper divisors (81417326326658).

81608150987902 is a wasteful number, since it uses less digits than its factorization.

81608150987902 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33299.

The product of its (nonzero) digits is 17418240, while the sum is 64.

The spelling of 81608150987902 in words is "eighty-one trillion, six hundred eight billion, one hundred fifty million, nine hundred eighty-seven thousand, nine hundred two".