661422436 has 24 divisors (see below), whose sum is σ = 1171589216. Its totient is φ = 326695680.

The previous prime is 661422409. The next prime is 661422481. The reversal of 661422436 is 634224166.

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 7 ways as a sum of consecutive naturals, for example, 266875 + ... + 269341.

Almost surely, 2^661422436 is an apocalyptic number.

It is an amenable number.

661422436 is a deficient number, since it is larger than the sum of its proper divisors (510166780).

661422436 is a wasteful number, since it uses less digits than its factorization.

661422436 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3259 (or 3257 counting only the distinct ones).

The product of its digits is 41472, while the sum is 34.

The square root of 661422436 is about 25718.1343802384. The cubic root of 661422436 is about 871.2838033250.

The spelling of 661422436 in words is "six hundred sixty-one million, four hundred twenty-two thousand, four hundred thirty-six".