661930466 has 8 divisors (see below), whose sum is σ = 994314204. Its totient is φ = 330492400.

The previous prime is 661930463. The next prime is 661930471. The reversal of 661930466 is 664039166.

It can be written as a sum of positive squares in 2 ways, for example, as 654285241 + 7645225 = 25579^2 + 2765^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

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 in 3 ways as a sum of consecutive naturals, for example, 234665 + ... + 237468.

Almost surely, 2^661930466 is an apocalyptic number.

661930466 is a deficient number, since it is larger than the sum of its proper divisors (332383738).

661930466 is a wasteful number, since it uses less digits than its factorization.

661930466 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 472836.

The product of its (nonzero) digits is 139968, while the sum is 41.

The square root of 661930466 is about 25728.0093672247. The cubic root of 661930466 is about 871.5068201680.

The spelling of 661930466 in words is "six hundred sixty-one million, nine hundred thirty thousand, four hundred sixty-six".