661622774 has 8 divisors (see below), whose sum is σ = 992679240. Its totient is φ = 330729696.

The previous prime is 661622749. The next prime is 661622777. The reversal of 661622774 is 477226166.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (661622777) 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, 30164 + ... + 47255.

It is an arithmetic number, because the mean of its divisors is an integer number (124084905).

Almost surely, 2^661622774 is an apocalyptic number.

661622774 is a deficient number, since it is larger than the sum of its proper divisors (331056466).

661622774 is a wasteful number, since it uses less digits than its factorization.

661622774 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81694.

The product of its digits is 169344, while the sum is 41.

The square root of 661622774 is about 25722.0289635169. The cubic root of 661622774 is about 871.3717620559.

The spelling of 661622774 in words is "six hundred sixty-one million, six hundred twenty-two thousand, seven hundred seventy-four".