661130712 has 48 divisors (see below), whose sum is σ = 1953343080. Its totient is φ = 200342400.

The previous prime is 661130677. The next prime is 661130747. The reversal of 661130712 is 217031166.

661130712 is a `hidden beast` number, since 6 + 611 + 30 + 7 + 12 = 666.

It is an interprime number because it is at equal distance from previous prime (661130677) and next prime (661130747).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 416589 + ... + 418172.

Almost surely, 2^661130712 is an apocalyptic number.

It is an amenable number.

661130712 is an abundant number, since it is smaller than the sum of its proper divisors (1292212368).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

661130712 is a wasteful number, since it uses less digits than its factorization.

661130712 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 834784 (or 834777 counting only the distinct ones).

The product of its (nonzero) digits is 1512, while the sum is 27.

The square root of 661130712 is about 25712.4621924856. The cubic root of 661130712 is about 871.1556896516.

Adding to 661130712 its reverse (217031166), we get a palindrome (878161878).

The spelling of 661130712 in words is "six hundred sixty-one million, one hundred thirty thousand, seven hundred twelve".