661057344 has 42 divisors (see below), whose sum is σ = 1894803170. Its totient is φ = 220352256.

The previous prime is 661057339. The next prime is 661057351. The reversal of 661057344 is 443750166.

It is a happy number.

661057344 is a `hidden beast` number, since 6 + 610 + 5 + 7 + 34 + 4 = 666.

It can be written as a sum of positive squares in only one way, i.e., 620607744 + 40449600 = 24912^2 + 6360^2 .

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 661057299 and 661057308.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 573259 + ... + 574410.

Almost surely, 2^661057344 is an apocalyptic number.

661057344 is a gapful number since it is divisible by the number (64) formed by its first and last digit.

It is an amenable number.

661057344 is an abundant number, since it is smaller than the sum of its proper divisors (1233745826).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

661057344 is a wasteful number, since it uses less digits than its factorization.

661057344 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1147687 (or 1147674 counting only the distinct ones).

The product of its (nonzero) digits is 60480, while the sum is 36.

The square root of 661057344 is about 25711.0354517277. The cubic root of 661057344 is about 871.1234633894.

The spelling of 661057344 in words is "six hundred sixty-one million, fifty-seven thousand, three hundred forty-four".