81201415679 has 4 divisors (see below), whose sum is σ = 82577710920. Its totient is φ = 79825120440.

The previous prime is 81201415663. The next prime is 81201415697. The reversal of 81201415679 is 97651410218.

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 81201415679 - 2⁴ = 81201415663 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 (81201415279) 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, 688147532 + ... + 688147649.

It is an arithmetic number, because the mean of its divisors is an integer number (20644427730).

Almost surely, 2^81201415679 is an apocalyptic number.

81201415679 is a deficient number, since it is larger than the sum of its proper divisors (1376295241).

81201415679 is a wasteful number, since it uses less digits than its factorization.

81201415679 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1376295240.

The product of its (nonzero) digits is 120960, while the sum is 44.

The spelling of 81201415679 in words is "eighty-one billion, two hundred one million, four hundred fifteen thousand, six hundred seventy-nine".