661933319 has 4 divisors (see below), whose sum is σ = 662102040. Its totient is φ = 661764600.

The previous prime is 661933291. The next prime is 661933361. The reversal of 661933319 is 913339166.

It is a happy number.

661933319 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 cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-661933319 is a prime.

It is a super-2 number, since 2×661933319² = 876311437604711522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (661933379) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 78332 + ... + 86369.

It is an arithmetic number, because the mean of its divisors is an integer number (165525510).

Almost surely, 2^661933319 is an apocalyptic number.

661933319 is a deficient number, since it is larger than the sum of its proper divisors (168721).

661933319 is a wasteful number, since it uses less digits than its factorization.

661933319 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 168720.

The product of its digits is 78732, while the sum is 41.

The square root of 661933319 is about 25728.0648125738. The cubic root of 661933319 is about 871.5080722660.

The spelling of 661933319 in words is "six hundred sixty-one million, nine hundred thirty-three thousand, three hundred nineteen".