81017081507 has 8 divisors (see below), whose sum is σ = 82404319680. Its totient is φ = 79630312360.

The previous prime is 81017081503. The next prime is 81017081513. The reversal of 81017081507 is 70518071018.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 81017081507 - 2² = 81017081503 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81017081503) 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, 240428 + ... + 468870.

It is an arithmetic number, because the mean of its divisors is an integer number (10300539960).

Almost surely, 2^81017081507 is an apocalyptic number.

81017081507 is a deficient number, since it is larger than the sum of its proper divisors (1387238173).

81017081507 is a wasteful number, since it uses less digits than its factorization.

81017081507 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 234513.

The product of its (nonzero) digits is 15680, while the sum is 38.

The spelling of 81017081507 in words is "eighty-one billion, seventeen million, eighty-one thousand, five hundred seven".