661930468 has 6 divisors (see below), whose sum is σ = 1158378326. Its totient is φ = 330965232.

The previous prime is 661930463. The next prime is 661930471. The reversal of 661930468 is 864039166.

It can be written as a sum of positive squares in only one way, i.e., 661929984 + 484 = 25728^2 + 22^2 .

It is not an unprimeable number, because it can be changed into a prime (661930463) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82741305 + ... + 82741312.

Almost surely, 2^661930468 is an apocalyptic number.

It is an amenable number.

661930468 is a deficient number, since it is larger than the sum of its proper divisors (496447858).

661930468 is a wasteful number, since it uses less digits than its factorization.

661930468 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 165482621 (or 165482619 counting only the distinct ones).

The product of its (nonzero) digits is 186624, while the sum is 43.

The square root of 661930468 is about 25728.0094060928. The cubic root of 661930468 is about 871.5068210457.

The spelling of 661930468 in words is "six hundred sixty-one million, nine hundred thirty thousand, four hundred sixty-eight".