661320614 has 4 divisors (see below), whose sum is σ = 991980924. Its totient is φ = 330660306.

The previous prime is 661320599. The next prime is 661320637. The reversal of 661320614 is 416023166.

It is a happy number.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 165330152 + ... + 165330155.

It is an arithmetic number, because the mean of its divisors is an integer number (247995231).

Almost surely, 2^661320614 is an apocalyptic number.

661320614 is a deficient number, since it is larger than the sum of its proper divisors (330660310).

661320614 is a wasteful number, since it uses less digits than its factorization.

661320614 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 330660309.

The product of its (nonzero) digits is 5184, while the sum is 29.

The square root of 661320614 is about 25716.1547281082. The cubic root of 661320614 is about 871.2390913994.

The spelling of 661320614 in words is "six hundred sixty-one million, three hundred twenty thousand, six hundred fourteen".