661374344 has 32 divisors (see below), whose sum is σ = 1315660800. Its totient is φ = 310806720.

The previous prime is 661374313. The next prime is 661374347. The reversal of 661374344 is 443473166.

It is a happy number.

661374344 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a hoax number, since the sum of its digits (38) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (38).

It is a junction number, because it is equal to n+sod(n) for n = 661374298 and 661374307.

It is not an unprimeable number, because it can be changed into a prime (661374347) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2174 + ... + 36434.

It is an arithmetic number, because the mean of its divisors is an integer number (41114400).

Almost surely, 2^661374344 is an apocalyptic number.

It is an amenable number.

661374344 is a deficient number, since it is larger than the sum of its proper divisors (654286456).

661374344 is a wasteful number, since it uses less digits than its factorization.

661374344 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34413 (or 34409 counting only the distinct ones).

The product of its digits is 145152, while the sum is 38.

The square root of 661374344 is about 25717.1993809590. The cubic root of 661374344 is about 871.2626858092.

The spelling of 661374344 in words is "six hundred sixty-one million, three hundred seventy-four thousand, three hundred forty-four".