661424052 has 24 divisors (see below), whose sum is σ = 1544457600. Its totient is φ = 220312576.

The previous prime is 661424051. The next prime is 661424063. The reversal of 661424052 is 250424166.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (661424051) 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, 2652 + ... + 36467.

It is an arithmetic number, because the mean of its divisors is an integer number (64352400).

Almost surely, 2^661424052 is an apocalyptic number.

It is an amenable number.

661424052 is an abundant number, since it is smaller than the sum of its proper divisors (883033548).

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

661424052 is a wasteful number, since it uses less digits than its factorization.

661424052 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40535 (or 40533 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 30.

The square root of 661424052 is about 25718.1657977392. The cubic root of 661424052 is about 871.2845129035.

The spelling of 661424052 in words is "six hundred sixty-one million, four hundred twenty-four thousand, fifty-two".