661622207 has 8 divisors (see below), whose sum is σ = 679261632. Its totient is φ = 644054400.

The previous prime is 661622177. The next prime is 661622219. The reversal of 661622207 is 702226166.

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 661622207 - 2²⁰ = 660573631 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (661622107) 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, 1082 + ... + 36392.

It is an arithmetic number, because the mean of its divisors is an integer number (84907704).

Almost surely, 2^661622207 is an apocalyptic number.

661622207 is a deficient number, since it is larger than the sum of its proper divisors (17639425).

661622207 is a wasteful number, since it uses less digits than its factorization.

661622207 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35809.

The product of its (nonzero) digits is 12096, while the sum is 32.

The square root of 661622207 is about 25722.0179418334. The cubic root of 661622207 is about 871.3715131387.

The spelling of 661622207 in words is "six hundred sixty-one million, six hundred twenty-two thousand, two hundred seven".