661190764 has 24 divisors (see below), whose sum is σ = 1276486848. Its totient is φ = 297720960.

The previous prime is 661190759. The next prime is 661190767. The reversal of 661190764 is 467091166.

It is not an unprimeable number, because it can be changed into a prime (661190767) 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, 152932 + ... + 157195.

It is an arithmetic number, because the mean of its divisors is an integer number (53186952).

Almost surely, 2^661190764 is an apocalyptic number.

It is an amenable number.

661190764 is a deficient number, since it is larger than the sum of its proper divisors (615296084).

661190764 is a wasteful number, since it uses less digits than its factorization.

661190764 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 310185 (or 310183 counting only the distinct ones).

The product of its (nonzero) digits is 54432, while the sum is 40.

The square root of 661190764 is about 25713.6299265584. The cubic root of 661190764 is about 871.1820652012.

The spelling of 661190764 in words is "six hundred sixty-one million, one hundred ninety thousand, seven hundred sixty-four".