81074194957 has 16 divisors (see below), whose sum is σ = 93270258432. Its totient is φ = 69032678400.

The previous prime is 81074194951. The next prime is 81074194961. The reversal of 81074194957 is 75949147018.

It is a happy number.

It is not a de Polignac number, because 81074194957 - 2⁷ = 81074194829 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 81074194898 and 81074194907.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81074194951) 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, 904248 + ... + 989854.

It is an arithmetic number, because the mean of its divisors is an integer number (5829391152).

Almost surely, 2^81074194957 is an apocalyptic number.

It is an amenable number.

81074194957 is a deficient number, since it is larger than the sum of its proper divisors (12196063475).

81074194957 is a wasteful number, since it uses less digits than its factorization.

81074194957 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86508.

The product of its (nonzero) digits is 2540160, while the sum is 55.

The spelling of 81074194957 in words is "eighty-one billion, seventy-four million, one hundred ninety-four thousand, nine hundred fifty-seven".