661073712 has 40 divisors (see below), whose sum is σ = 1839142704. Its totient is φ = 203407104.

The previous prime is 661073711. The next prime is 661073719. The reversal of 661073712 is 217370166.

It is not an unprimeable number, because it can be changed into a prime (661073711) 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, 529083 + ... + 530330.

Almost surely, 2^661073712 is an apocalyptic number.

It is an amenable number.

661073712 is an abundant number, since it is smaller than the sum of its proper divisors (1178068992).

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

661073712 is a wasteful number, since it uses less digits than its factorization.

661073712 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1059437 (or 1059431 counting only the distinct ones).

The product of its (nonzero) digits is 10584, while the sum is 33.

The square root of 661073712 is about 25711.3537566578. The cubic root of 661073712 is about 871.1306530991.

The spelling of 661073712 in words is "six hundred sixty-one million, seventy-three thousand, seven hundred twelve".