661952450 has 24 divisors (see below), whose sum is σ = 1231909248. Its totient is φ = 264635280.

The previous prime is 661952413. The next prime is 661952453. The reversal of 661952450 is 54259166.

It is a super-2 number, since 2×661952450² = 876362092122005000, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (661952453) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 171239 + ... + 175061.

It is an arithmetic number, because the mean of its divisors is an integer number (51329552).

Almost surely, 2^661952450 is an apocalyptic number.

661952450 is a deficient number, since it is larger than the sum of its proper divisors (569956798).

661952450 is a wasteful number, since it uses less digits than its factorization.

661952450 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7298 (or 7293 counting only the distinct ones).

The product of its (nonzero) digits is 64800, while the sum is 38.

The square root of 661952450 is about 25728.4366023278. The cubic root of 661952450 is about 871.5164682075.

The spelling of 661952450 in words is "six hundred sixty-one million, nine hundred fifty-two thousand, four hundred fifty".