81616051202715 has 96 divisors (see below), whose sum is σ = 155691294647616. Its totient is φ = 39380560404480.

The previous prime is 81616051202687. The next prime is 81616051202729. The reversal of 81616051202715 is 51720215061618.

81616051202715 is a `hidden beast` number, since 8 + 1 + 6 + 1 + 60 + 512 + 0 + 2 + 71 + 5 = 666.

It is not a de Polignac number, because 81616051202715 - 2⁸ = 81616051202459 is a prime.

It is a super-2 number, since 2×81616051202715² (a number of 29 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 15020866 + ... + 19719495.

It is an arithmetic number, because the mean of its divisors is an integer number (1621784319246).

Almost surely, 2^{81616051202715} is an apocalyptic number.

81616051202715 is a gapful number since it is divisible by the number (85) formed by its first and last digit.

81616051202715 is a deficient number, since it is larger than the sum of its proper divisors (74075243444901).

81616051202715 is a wasteful number, since it uses less digits than its factorization.

81616051202715 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34740509 (or 34740506 counting only the distinct ones).

The product of its (nonzero) digits is 201600, while the sum is 45.

The spelling of 81616051202715 in words is "eighty-one trillion, six hundred sixteen billion, fifty-one million, two hundred two thousand, seven hundred fifteen".