661979010984 has 32 divisors (see below), whose sum is σ = 1654979881920. Its totient is φ = 220655356416.

The previous prime is 661979010971. The next prime is 661979010997. The reversal of 661979010984 is 489010979166.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (661979010971) and next prime (661979010997).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1132344 + ... + 1614360.

It is an arithmetic number, because the mean of its divisors is an integer number (51718121310).

Almost surely, 2^661979010984 is an apocalyptic number.

It is an amenable number.

661979010984 is an abundant number, since it is smaller than the sum of its proper divisors (993000870936).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

661979010984 is a wasteful number, since it uses less digits than its factorization.

661979010984 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 539249 (or 539245 counting only the distinct ones).

The product of its (nonzero) digits is 5878656, while the sum is 60.

The spelling of 661979010984 in words is "six hundred sixty-one billion, nine hundred seventy-nine million, ten thousand, nine hundred eighty-four".