661430659 has 8 divisors (see below), whose sum is σ = 668270592. Its totient is φ = 654618120.

The previous prime is 661430629. The next prime is 661430699. The reversal of 661430659 is 956034166.

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

It is a cyclic number.

It is not a de Polignac number, because 661430659 - 2⁷ = 661430531 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (661430629) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 43582 + ... + 56764.

It is an arithmetic number, because the mean of its divisors is an integer number (83533824).

Almost surely, 2^661430659 is an apocalyptic number.

661430659 is a deficient number, since it is larger than the sum of its proper divisors (6839933).

661430659 is a wasteful number, since it uses less digits than its factorization.

661430659 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13697.

The product of its (nonzero) digits is 116640, while the sum is 40.

The square root of 661430659 is about 25718.2942474807. The cubic root of 661430659 is about 871.2874139963.

It can be divided in two parts, 6614 and 30659, that added together give a palindrome (37273).

The spelling of 661430659 in words is "six hundred sixty-one million, four hundred thirty thousand, six hundred fifty-nine".