84617318521 has 8 divisors (see below), whose sum is σ = 84786704288. Its totient is φ = 84448008000.

The previous prime is 84617318479. The next prime is 84617318563. The reversal of 84617318521 is 12581371648.

It is an interprime number because it is at equal distance from previous prime (84617318479) and next prime (84617318563).

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

It is a 4-Lehmer number, since φ(84617318521) divides (84617318521-1)⁴.

It is a cyclic number.

It is not a de Polignac number, because 84617318521 - 2⁷ = 84617318393 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (84617318581) by changing a digit.

It is a Zeisel number, with parameters (7, 564).

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2588086 + ... + 2620576.

It is an arithmetic number, because the mean of its divisors is an integer number (10598338036).

Almost surely, 2^84617318521 is an apocalyptic number.

It is an amenable number.

84617318521 is a deficient number, since it is larger than the sum of its proper divisors (169385767).

84617318521 is a wasteful number, since it uses less digits than its factorization.

84617318521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37623.

The product of its digits is 322560, while the sum is 46.

The spelling of 84617318521 in words is "eighty-four billion, six hundred seventeen million, three hundred eighteen thousand, five hundred twenty-one".