661152511566044 has 12 divisors (see below), whose sum is σ = 1159778272081800. Its totient is φ = 329787290971248.

The previous prime is 661152511565983. The next prime is 661152511566121. The reversal of 661152511566044 is 440665115251166.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 197241201059 + ... + 197241204410.

It is an arithmetic number, because the mean of its divisors is an integer number (96648189340150).

Almost surely, 2^{661152511566044} is an apocalyptic number.

It is an amenable number.

661152511566044 is a deficient number, since it is larger than the sum of its proper divisors (498625760515756).

661152511566044 is a wasteful number, since it uses less digits than its factorization.

661152511566044 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 394482405892 (or 394482405890 counting only the distinct ones).

The product of its (nonzero) digits is 5184000, while the sum is 53.

The spelling of 661152511566044 in words is "six hundred sixty-one trillion, one hundred fifty-two billion, five hundred eleven million, five hundred sixty-six thousand, forty-four".