661164562 has 8 divisors (see below), whose sum is σ = 1025945100. Its totient is φ = 319182864.

The previous prime is 661164529. The next prime is 661164563. The reversal of 661164562 is 265461166.

It can be written as a sum of positive squares in 2 ways, for example, as 630461881 + 30702681 = 25109^2 + 5541^2 .

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 (661164563) 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, 5699637 + ... + 5699752.

Almost surely, 2^661164562 is an apocalyptic number.

661164562 is a deficient number, since it is larger than the sum of its proper divisors (364780538).

661164562 is a wasteful number, since it uses less digits than its factorization.

661164562 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11399420.

The product of its digits is 51840, while the sum is 37.

The square root of 661164562 is about 25713.1204251837. The cubic root of 661164562 is about 871.1705571689.

The spelling of 661164562 in words is "six hundred sixty-one million, one hundred sixty-four thousand, five hundred sixty-two".