81457161015 has 16 divisors (see below), whose sum is σ = 130336615296. Its totient is φ = 43442100000.

The previous prime is 81457160971. The next prime is 81457161113. The reversal of 81457161015 is 51016175418.

It is a happy number.

It is not a de Polignac number, because 81457161015 - 2¹³ = 81457152823 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 345940 + ... + 531590.

It is an arithmetic number, because the mean of its divisors is an integer number (8146038456).

Almost surely, 2^81457161015 is an apocalyptic number.

81457161015 is a deficient number, since it is larger than the sum of its proper divisors (48879454281).

81457161015 is a wasteful number, since it uses less digits than its factorization.

81457161015 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 214910.

The product of its (nonzero) digits is 33600, while the sum is 39.

The spelling of 81457161015 in words is "eighty-one billion, four hundred fifty-seven million, one hundred sixty-one thousand, fifteen".