661126474016 has 48 divisors (see below), whose sum is σ = 1308164745888. Its totient is φ = 328896960000.

The previous prime is 661126473989. The next prime is 661126474033. The reversal of 661126474016 is 610474621166.

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, 7611311 + ... + 7697681.

It is an arithmetic number, because the mean of its divisors is an integer number (27253432206).

Almost surely, 2^661126474016 is an apocalyptic number.

It is an amenable number.

661126474016 is a deficient number, since it is larger than the sum of its proper divisors (647038271872).

661126474016 is a wasteful number, since it uses less digits than its factorization.

661126474016 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 87585 (or 87577 counting only the distinct ones).

The product of its (nonzero) digits is 290304, while the sum is 44.

The spelling of 661126474016 in words is "six hundred sixty-one billion, one hundred twenty-six million, four hundred seventy-four thousand, sixteen".