661434235 has 16 divisors (see below), whose sum is σ = 989574912. Its totient is φ = 412322400.

The previous prime is 661434229. The next prime is 661434247. The reversal of 661434235 is 532434166.

It is not a de Polignac number, because 661434235 - 2⁷ = 661434107 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 661434235.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 858621 + ... + 859390.

It is an arithmetic number, because the mean of its divisors is an integer number (61848432).

Almost surely, 2^661434235 is an apocalyptic number.

661434235 is a deficient number, since it is larger than the sum of its proper divisors (328140677).

661434235 is a wasteful number, since it uses less digits than its factorization.

661434235 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1718034.

The product of its digits is 51840, while the sum is 34.

The square root of 661434235 is about 25718.3637698824. The cubic root of 661434235 is about 871.2889841877.

The spelling of 661434235 in words is "six hundred sixty-one million, four hundred thirty-four thousand, two hundred thirty-five".