661452250165 has 8 divisors (see below), whose sum is σ = 907134514560. Its totient is φ = 453567257232.

The previous prime is 661452250163. The next prime is 661452250187. The reversal of 661452250165 is 561052254166.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 661452250165 - 2¹ = 661452250163 is a prime.

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 7 ways as a sum of consecutive naturals, for example, 9449317825 + ... + 9449317894.

It is an arithmetic number, because the mean of its divisors is an integer number (113391814320).

Almost surely, 2^661452250165 is an apocalyptic number.

It is an amenable number.

661452250165 is a deficient number, since it is larger than the sum of its proper divisors (245682264395).

661452250165 is a wasteful number, since it uses less digits than its factorization.

661452250165 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18898635731.

The product of its (nonzero) digits is 432000, while the sum is 43.

The spelling of 661452250165 in words is "six hundred sixty-one billion, four hundred fifty-two million, two hundred fifty thousand, one hundred sixty-five".