661922911 has 8 divisors (see below), whose sum is σ = 743833440. Its totient is φ = 584440032.

The previous prime is 661922903. The next prime is 661922923. The reversal of 661922911 is 119229166.

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 661922911 - 2³ = 661922903 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 (661922971) 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, 1106596 + ... + 1107193.

It is an arithmetic number, because the mean of its divisors is an integer number (92979180).

Almost surely, 2^661922911 is an apocalyptic number.

661922911 is a deficient number, since it is larger than the sum of its proper divisors (81910529).

661922911 is a wasteful number, since it uses less digits than its factorization.

661922911 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2213825.

The product of its digits is 11664, while the sum is 37.

The square root of 661922911 is about 25727.8625423878. The cubic root of 661922911 is about 871.5035044828.

The spelling of 661922911 in words is "six hundred sixty-one million, nine hundred twenty-two thousand, nine hundred eleven".