661534675 has 6 divisors (see below), whose sum is σ = 820303028. Its totient is φ = 529227720.

The previous prime is 661534663. The next prime is 661534681. The reversal of 661534675 is 576435166.

It is a de Polignac number, because none of the positive numbers 2^k-661534675 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 13230669 + ... + 13230718.

Almost surely, 2^661534675 is an apocalyptic number.

661534675 is a deficient number, since it is larger than the sum of its proper divisors (158768353).

661534675 is a wasteful number, since it uses less digits than its factorization.

661534675 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26461397 (or 26461392 counting only the distinct ones).

The product of its digits is 453600, while the sum is 43.

The square root of 661534675 is about 25720.3163860789. The cubic root of 661534675 is about 871.3330842315. Note that the first 3 decimals are identical.

The spelling of 661534675 in words is "six hundred sixty-one million, five hundred thirty-four thousand, six hundred seventy-five".