660861374 has 4 divisors (see below), whose sum is σ = 991292064. Its totient is φ = 330430686.

The previous prime is 660861371. The next prime is 660861389. The reversal of 660861374 is 473168066.

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 (660861371) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 165215342 + ... + 165215345.

It is an arithmetic number, because the mean of its divisors is an integer number (247823016).

Almost surely, 2^660861374 is an apocalyptic number.

660861374 is a deficient number, since it is larger than the sum of its proper divisors (330430690).

660861374 is a wasteful number, since it uses less digits than its factorization.

660861374 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 330430689.

The product of its (nonzero) digits is 145152, while the sum is 41.

The square root of 660861374 is about 25707.2241597571. The cubic root of 660861374 is about 871.0373735624.

The spelling of 660861374 in words is "six hundred sixty million, eight hundred sixty-one thousand, three hundred seventy-four".