661661152050 has 96 divisors (see below), whose sum is σ = 1644532243200. Its totient is φ = 176054978560.

The previous prime is 661661152049. The next prime is 661661152057. The reversal of 661661152050 is 50251166166.

It is not an unprimeable number, because it can be changed into a prime (661661152057) by changing a digit.

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 47 ways as a sum of consecutive naturals, for example, 249024322 + ... + 249026978.

It is an arithmetic number, because the mean of its divisors is an integer number (17130544200).

Almost surely, 2^661661152050 is an apocalyptic number.

661661152050 is an abundant number, since it is smaller than the sum of its proper divisors (982871091150).

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

661661152050 is a wasteful number, since it uses less digits than its factorization.

661661152050 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5700 (or 5695 counting only the distinct ones).

The product of its (nonzero) digits is 64800, while the sum is 39.

The spelling of 661661152050 in words is "six hundred sixty-one billion, six hundred sixty-one million, one hundred fifty-two thousand, fifty".