661673299 has 4 divisors (see below), whose sum is σ = 756198064. Its totient is φ = 567148536.

The previous prime is 661673291. The next prime is 661673317. The reversal of 661673299 is 992376166.

661673299 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 not a de Polignac number, because 661673299 - 2³ = 661673291 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (661673291) 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, 47262372 + ... + 47262385.

It is an arithmetic number, because the mean of its divisors is an integer number (189049516).

Almost surely, 2^661673299 is an apocalyptic number.

661673299 is a deficient number, since it is larger than the sum of its proper divisors (94524765).

661673299 is an equidigital number, since it uses as much as digits as its factorization.

661673299 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 94524764.

The product of its digits is 734832, while the sum is 49.

The square root of 661673299 is about 25723.0110795762. The cubic root of 661673299 is about 871.3939423372.

The spelling of 661673299 in words is "six hundred sixty-one million, six hundred seventy-three thousand, two hundred ninety-nine".