661797222 has 16 divisors (see below), whose sum is σ = 1324612272. Its totient is φ = 220429440.

The previous prime is 661797221. The next prime is 661797229. The reversal of 661797222 is 222797166.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (661797221) 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, 33823 + ... + 49674.

It is an arithmetic number, because the mean of its divisors is an integer number (82788267).

Almost surely, 2^661797222 is an apocalyptic number.

661797222 is an abundant number, since it is smaller than the sum of its proper divisors (662815050).

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

661797222 is a wasteful number, since it uses less digits than its factorization.

661797222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84823.

The product of its digits is 127008, while the sum is 42.

The square root of 661797222 is about 25725.4197633391. The cubic root of 661797222 is about 871.4483392785.

The spelling of 661797222 in words is "six hundred sixty-one million, seven hundred ninety-seven thousand, two hundred twenty-two".