661124319 has 4 divisors (see below), whose sum is σ = 881499096. Its totient is φ = 440749544.

The previous prime is 661124291. The next prime is 661124327. The reversal of 661124319 is 913421166.

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 661124319 - 2⁸ = 661124063 is a prime.

It is a super-2 number, since 2×661124319² = 874170730346427522, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 661124319.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (661124329) 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, 110187384 + ... + 110187389.

It is an arithmetic number, because the mean of its divisors is an integer number (220374774).

Almost surely, 2^661124319 is an apocalyptic number.

661124319 is a deficient number, since it is larger than the sum of its proper divisors (220374777).

661124319 is a wasteful number, since it uses less digits than its factorization.

661124319 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 220374776.

The product of its digits is 7776, while the sum is 33.

The square root of 661124319 is about 25712.3378750358. The cubic root of 661124319 is about 871.1528816763.

The spelling of 661124319 in words is "six hundred sixty-one million, one hundred twenty-four thousand, three hundred nineteen".