661875222 has 32 divisors (see below), whose sum is σ = 1403625600. Its totient is φ = 207482688.

The previous prime is 661875211. The next prime is 661875223. The reversal of 661875222 is 222578166.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (661875223) 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, 5572 + ... + 36807.

It is an arithmetic number, because the mean of its divisors is an integer number (43863300).

Almost surely, 2^661875222 is an apocalyptic number.

661875222 is an abundant number, since it is smaller than the sum of its proper divisors (741750378).

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

661875222 is a wasteful number, since it uses less digits than its factorization.

661875222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42540.

The product of its digits is 80640, while the sum is 39.

The square root of 661875222 is about 25726.9357289204. The cubic root of 661875222 is about 871.4825744883.

The spelling of 661875222 in words is "six hundred sixty-one million, eight hundred seventy-five thousand, two hundred twenty-two".