15642420985 has 8 divisors (see below), whose sum is σ = 19758847680. Its totient is φ = 11855308464.

The previous prime is 15642420979. The next prime is 15642421013. The reversal of 15642420985 is 58902424651.

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 15642420985 - 2²⁷ = 15508203257 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 82328437 + ... + 82328626.

It is an arithmetic number, because the mean of its divisors is an integer number (2469855960).

Almost surely, 2^15642420985 is an apocalyptic number.

It is an amenable number.

15642420985 is a deficient number, since it is larger than the sum of its proper divisors (4116426695).

15642420985 is a wasteful number, since it uses less digits than its factorization.

15642420985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 164657087.

The product of its (nonzero) digits is 691200, while the sum is 46.

The spelling of 15642420985 in words is "fifteen billion, six hundred forty-two million, four hundred twenty thousand, nine hundred eighty-five".