661460624 has 20 divisors (see below), whose sum is σ = 1398087600. Its totient is φ = 300663840.

The previous prime is 661460621. The next prime is 661460627. The reversal of 661460624 is 426064166.

It is an interprime number because it is at equal distance from previous prime (661460621) and next prime (661460627).

It is not an unprimeable number, because it can be changed into a prime (661460621) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1878974 + ... + 1879325.

It is an arithmetic number, because the mean of its divisors is an integer number (69904380).

Almost surely, 2^661460624 is an apocalyptic number.

It is an amenable number.

661460624 is an abundant number, since it is smaller than the sum of its proper divisors (736626976).

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

661460624 is a wasteful number, since it uses less digits than its factorization.

661460624 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3758318 (or 3758312 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 35.

The square root of 661460624 is about 25718.8768028466. The cubic root of 661460624 is about 871.3005711997.

The spelling of 661460624 in words is "six hundred sixty-one million, four hundred sixty thousand, six hundred twenty-four".