81074428415 has 4 divisors (see below), whose sum is σ = 97289314104. Its totient is φ = 64859542728.

The previous prime is 81074428411. The next prime is 81074428417. The reversal of 81074428415 is 51482447018.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 81074428415 - 2² = 81074428411 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81074428411) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8107442837 + ... + 8107442846.

It is an arithmetic number, because the mean of its divisors is an integer number (24322328526).

Almost surely, 2^81074428415 is an apocalyptic number.

81074428415 is a deficient number, since it is larger than the sum of its proper divisors (16214885689).

81074428415 is a wasteful number, since it uses less digits than its factorization.

81074428415 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16214885688.

The product of its (nonzero) digits is 286720, while the sum is 44.

The spelling of 81074428415 in words is "eighty-one billion, seventy-four million, four hundred twenty-eight thousand, four hundred fifteen".