661189512 has 32 divisors (see below), whose sum is σ = 1739973600. Its totient is φ = 208796544.

The previous prime is 661189511. The next prime is 661189541. The reversal of 661189512 is 215981166.

661189512 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-3 number, since 3×661189512³ (a number of 27 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (661189511) 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, 724533 + ... + 725444.

It is an arithmetic number, because the mean of its divisors is an integer number (54374175).

Almost surely, 2^661189512 is an apocalyptic number.

It is an amenable number.

661189512 is an abundant number, since it is smaller than the sum of its proper divisors (1078784088).

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

661189512 is a wasteful number, since it uses less digits than its factorization.

661189512 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1450005 (or 1450001 counting only the distinct ones).

The product of its digits is 25920, while the sum is 39.

The square root of 661189512 is about 25713.6055814816. The cubic root of 661189512 is about 871.1815153243.

The spelling of 661189512 in words is "six hundred sixty-one million, one hundred eighty-nine thousand, five hundred twelve".