81694038795 has 16 divisors (see below), whose sum is σ = 130721885952. Its totient is φ = 43566346080.

The previous prime is 81694038791. The next prime is 81694038799. The reversal of 81694038795 is 59783049618.

It is an interprime number because it is at equal distance from previous prime (81694038791) and next prime (81694038799).

It is not a de Polignac number, because 81694038795 - 2² = 81694038791 is a prime.

It is not an unprimeable number, because it can be changed into a prime (81694038791) 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, 56167 + ... + 408096.

It is an arithmetic number, because the mean of its divisors is an integer number (8170117872).

Almost surely, 2^81694038795 is an apocalyptic number.

81694038795 is a deficient number, since it is larger than the sum of its proper divisors (49027847157).

81694038795 is a wasteful number, since it uses less digits than its factorization.

81694038795 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 476002.

The product of its (nonzero) digits is 13063680, while the sum is 60.

The spelling of 81694038795 in words is "eighty-one billion, six hundred ninety-four million, thirty-eight thousand, seven hundred ninety-five".