661452426 has 32 divisors (see below), whose sum is σ = 1505750400. Its totient is φ = 215105760.

The previous prime is 661452413. The next prime is 661452437. The reversal of 661452426 is 624254166.

It is a super-2 number, since 2×661452426² = 875038623722570952, which contains 22 as substring.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 147166 + ... + 151593.

It is an arithmetic number, because the mean of its divisors is an integer number (47054700).

Almost surely, 2^661452426 is an apocalyptic number.

661452426 is an abundant number, since it is smaller than the sum of its proper divisors (844297974).

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

661452426 is a wasteful number, since it uses less digits than its factorization.

661452426 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 298811 (or 298805 counting only the distinct ones).

The product of its digits is 69120, while the sum is 36.

The square root of 661452426 is about 25718.7174252528. The cubic root of 661452426 is about 871.2969716145.

The spelling of 661452426 in words is "six hundred sixty-one million, four hundred fifty-two thousand, four hundred twenty-six".