661324574 has 4 divisors (see below), whose sum is σ = 991986864. Its totient is φ = 330662286.

The previous prime is 661324537. The next prime is 661324579. The reversal of 661324574 is 475423166.

It is a happy number.

661324574 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (661324579) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 165331142 + ... + 165331145.

It is an arithmetic number, because the mean of its divisors is an integer number (247996716).

Almost surely, 2^661324574 is an apocalyptic number.

661324574 is a deficient number, since it is larger than the sum of its proper divisors (330662290).

661324574 is a wasteful number, since it uses less digits than its factorization.

661324574 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 330662289.

The product of its digits is 120960, while the sum is 38.

The square root of 661324574 is about 25716.2317223967. The cubic root of 661324574 is about 871.2408303945.

The spelling of 661324574 in words is "six hundred sixty-one million, three hundred twenty-four thousand, five hundred seventy-four".