78621485667 has 16 divisors (see below), whose sum is σ = 108400465920. Its totient is φ = 50634360000.

The previous prime is 78621485659. The next prime is 78621485693. The reversal of 78621485667 is 76658412687.

It is not a de Polignac number, because 78621485667 - 2³ = 78621485659 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 78621485667.

It is not an unprimeable number, because it can be changed into a prime (78621485647) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 689959 + ... + 795792.

It is an arithmetic number, because the mean of its divisors is an integer number (6775029120).

Almost surely, 2^78621485667 is an apocalyptic number.

78621485667 is a deficient number, since it is larger than the sum of its proper divisors (29778980253).

78621485667 is a wasteful number, since it uses less digits than its factorization.

78621485667 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1486354.

The product of its digits is 27095040, while the sum is 60.

The spelling of 78621485667 in words is "seventy-eight billion, six hundred twenty-one million, four hundred eighty-five thousand, six hundred sixty-seven".