661452250164 has 48 divisors (see below), whose sum is σ = 1634240151936. Its totient is φ = 207506304000.

The previous prime is 661452250163. The next prime is 661452250187. The reversal of 661452250164 is 461052254166.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (661452250163) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7176009 + ... + 7267599.

It is an arithmetic number, because the mean of its divisors is an integer number (34046669832).

Almost surely, 2^661452250164 is an apocalyptic number.

It is an amenable number.

661452250164 is an abundant number, since it is smaller than the sum of its proper divisors (972787901772).

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

661452250164 is a wasteful number, since it uses less digits than its factorization.

661452250164 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 127016 (or 127014 counting only the distinct ones).

The product of its (nonzero) digits is 345600, while the sum is 42.

The spelling of 661452250164 in words is "six hundred sixty-one billion, four hundred fifty-two million, two hundred fifty thousand, one hundred sixty-four".