661322460164 has 6 divisors (see below), whose sum is σ = 1157314305294. Its totient is φ = 330661230080.

The previous prime is 661322460131. The next prime is 661322460167. The reversal of 661322460164 is 461064223166.

It can be written as a sum of positive squares in only one way, i.e., 331536427264 + 329786032900 = 575792^2 + 574270^2 .

It is not an unprimeable number, because it can be changed into a prime (661322460167) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82665307517 + ... + 82665307524.

It is an arithmetic number, because the mean of its divisors is an integer number (192885717549).

Almost surely, 2^661322460164 is an apocalyptic number.

It is an amenable number.

661322460164 is a deficient number, since it is larger than the sum of its proper divisors (495991845130).

661322460164 is a wasteful number, since it uses less digits than its factorization.

661322460164 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 165330615045 (or 165330615043 counting only the distinct ones).

The product of its (nonzero) digits is 248832, while the sum is 41.

The spelling of 661322460164 in words is "six hundred sixty-one billion, three hundred twenty-two million, four hundred sixty thousand, one hundred sixty-four".