661652428560178 has 128 divisors (see below), whose sum is σ = 1126566186520320. Its totient is φ = 288806611968000.

The previous prime is 661652428560127. The next prime is 661652428560239. The reversal of 661652428560178 is 871065824256166.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 87508583518 + ... + 87508591078.

It is an arithmetic number, because the mean of its divisors is an integer number (8801298332190).

Almost surely, 2^{661652428560178} is an apocalyptic number.

661652428560178 is a deficient number, since it is larger than the sum of its proper divisors (464913757960142).

661652428560178 is a wasteful number, since it uses less digits than its factorization.

661652428560178 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12204.

The product of its (nonzero) digits is 232243200, while the sum is 67.

The spelling of 661652428560178 in words is "six hundred sixty-one trillion, six hundred fifty-two billion, four hundred twenty-eight million, five hundred sixty thousand, one hundred seventy-eight".