86781625505 has 16 divisors (see below), whose sum is σ = 107738769600. Its totient is φ = 67025192640.

The previous prime is 86781625493. The next prime is 86781625561. The reversal of 86781625505 is 50552618768.

It is a happy number.

It is a de Polignac number, because none of the positive numbers 2^k-86781625505 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2168366 + ... + 2208024.

It is an arithmetic number, because the mean of its divisors is an integer number (6733673100).

Almost surely, 2^86781625505 is an apocalyptic number.

It is an amenable number.

86781625505 is a deficient number, since it is larger than the sum of its proper divisors (20957144095).

86781625505 is a wasteful number, since it uses less digits than its factorization.

86781625505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54784.

The product of its (nonzero) digits is 4032000, while the sum is 53.

The spelling of 86781625505 in words is "eighty-six billion, seven hundred eighty-one million, six hundred twenty-five thousand, five hundred five".