661979010983 has 8 divisors (see below), whose sum is σ = 678337925760. Its totient is φ = 645791394040.

The previous prime is 661979010971. The next prime is 661979010997. The reversal of 661979010983 is 389010979166.

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 661979010983 - 2⁶ = 661979010919 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (59).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (661979010683) 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 7 ways as a sum of consecutive naturals, for example, 42816635 + ... + 42832092.

It is an arithmetic number, because the mean of its divisors is an integer number (84792240720).

Almost surely, 2^661979010983 is an apocalyptic number.

661979010983 is a deficient number, since it is larger than the sum of its proper divisors (16358914777).

661979010983 is a wasteful number, since it uses less digits than its factorization.

661979010983 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85648917.

The product of its (nonzero) digits is 4408992, while the sum is 59.

The spelling of 661979010983 in words is "six hundred sixty-one billion, nine hundred seventy-nine million, ten thousand, nine hundred eighty-three".