661974883 has 8 divisors (see below), whose sum is σ = 709360848. Its totient is φ = 615527424.

The previous prime is 661974869. The next prime is 661974913. The reversal of 661974883 is 388479166.

It is a happy number.

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 661974883 - 2⁹ = 661974371 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 661974883.

It is not an unprimeable number, because it can be changed into a prime (661974083) 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 7 ways as a sum of consecutive naturals, for example, 233166 + ... + 235987.

It is an arithmetic number, because the mean of its divisors is an integer number (88670106).

Almost surely, 2^661974883 is an apocalyptic number.

661974883 is a deficient number, since it is larger than the sum of its proper divisors (47385965).

661974883 is a wasteful number, since it uses less digits than its factorization.

661974883 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 469253.

The product of its digits is 1741824, while the sum is 52.

The square root of 661974883 is about 25728.8725559438. The cubic root of 661974883 is about 871.5263130778.

The spelling of 661974883 in words is "six hundred sixty-one million, nine hundred seventy-four thousand, eight hundred eighty-three".