661423552 has 14 divisors (see below), whose sum is σ = 1312512488. Its totient is φ = 330711744.

The previous prime is 661423547. The next prime is 661423559. The reversal of 661423552 is 255324166.

It is a super-2 number, since 2×661423552² = 874962230280593408, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (661423559) by changing a digit.

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 as a sum of consecutive naturals, namely, 5167308 + ... + 5167435.

It is an arithmetic number, because the mean of its divisors is an integer number (93750892).

Almost surely, 2^661423552 is an apocalyptic number.

It is an amenable number.

661423552 is a deficient number, since it is larger than the sum of its proper divisors (651088936).

661423552 is a wasteful number, since it uses less digits than its factorization.

661423552 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10334755 (or 10334745 counting only the distinct ones).

The product of its digits is 43200, while the sum is 34.

The square root of 661423552 is about 25718.1560769819. The cubic root of 661423552 is about 871.2842933558.

The spelling of 661423552 in words is "six hundred sixty-one million, four hundred twenty-three thousand, five hundred fifty-two".