661434236 has 12 divisors (see below), whose sum is σ = 1168130040. Its totient is φ = 327682800.

The previous prime is 661434229. The next prime is 661434247. The reversal of 661434236 is 632434166.

It is a junction number, because it is equal to n+sod(n) for n = 661434196 and 661434205.

It is a congruent 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 3 ways as a sum of consecutive naturals, for example, 758090 + ... + 758961.

It is an arithmetic number, because the mean of its divisors is an integer number (97344170).

Almost surely, 2^661434236 is an apocalyptic number.

It is an amenable number.

661434236 is a deficient number, since it is larger than the sum of its proper divisors (506695804).

661434236 is a wasteful number, since it uses less digits than its factorization.

661434236 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1517164 (or 1517162 counting only the distinct ones).

The product of its digits is 62208, while the sum is 35.

The square root of 661434236 is about 25718.3637893238. The cubic root of 661434236 is about 871.2889846268.

The spelling of 661434236 in words is "six hundred sixty-one million, four hundred thirty-four thousand, two hundred thirty-six".