661422312 has 24 divisors (see below), whose sum is σ = 1791352290. Its totient is φ = 220474080.

The previous prime is 661422301. The next prime is 661422341. The reversal of 661422312 is 213224166.

It can be written as a sum of positive squares in only one way, i.e., 659154276 + 2268036 = 25674^2 + 1506^2 .

It is a tau number, because it is divible by the number of its divisors (24).

It is a super-2 number, since 2×661422312² = 874958949622850688, which contains 22 as substring.

It is a nude number because it is divisible by every one of its digits.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4593139 + ... + 4593282.

Almost surely, 2^661422312 is an apocalyptic number.

It is an amenable number.

661422312 is an abundant number, since it is smaller than the sum of its proper divisors (1129929978).

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

661422312 is a wasteful number, since it uses less digits than its factorization.

661422312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9186433 (or 9186426 counting only the distinct ones).

The product of its digits is 3456, while the sum is 27.

The square root of 661422312 is about 25718.1319694880. The cubic root of 661422312 is about 871.2837488771.

Adding to 661422312 its reverse (213224166), we get a palindrome (874646478).

The spelling of 661422312 in words is "six hundred sixty-one million, four hundred twenty-two thousand, three hundred twelve".