661474938259 has 16 divisors (see below), whose sum is σ = 668601853920. Its totient is φ = 654399002880.

The previous prime is 661474938251. The next prime is 661474938263. The reversal of 661474938259 is 952839474166.

It is a cyclic number.

It is not a de Polignac number, because 661474938259 - 2³ = 661474938251 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 661474938259.

It is not an unprimeable number, because it can be changed into a prime (661474938251) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 22012857 + ... + 22042885.

It is an arithmetic number, because the mean of its divisors is an integer number (41787615870).

Almost surely, 2^661474938259 is an apocalyptic number.

661474938259 is a deficient number, since it is larger than the sum of its proper divisors (7126915661).

661474938259 is a wasteful number, since it uses less digits than its factorization.

661474938259 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30870.

The product of its digits is 78382080, while the sum is 64.

The spelling of 661474938259 in words is "six hundred sixty-one billion, four hundred seventy-four million, nine hundred thirty-eight thousand, two hundred fifty-nine".