81178634417 has 8 divisors (see below), whose sum is σ = 83082801120. Its totient is φ = 79275208320.

The previous prime is 81178634401. The next prime is 81178634423. The reversal of 81178634417 is 71443687118.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 81178634417 - 2⁴ = 81178634401 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81178630417) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 39809 + ... + 404897.

It is an arithmetic number, because the mean of its divisors is an integer number (10385350140).

Almost surely, 2^81178634417 is an apocalyptic number.

It is an amenable number.

81178634417 is a deficient number, since it is larger than the sum of its proper divisors (1904166703).

81178634417 is a wasteful number, since it uses less digits than its factorization.

81178634417 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 370303.

The product of its digits is 903168, while the sum is 50.

The spelling of 81178634417 in words is "eighty-one billion, one hundred seventy-eight million, six hundred thirty-four thousand, four hundred seventeen".