660123456 has 112 divisors (see below), whose sum is σ = 1791492480. Its totient is φ = 214456320.

The previous prime is 660123439. The next prime is 660123469. The reversal of 660123456 is 654321066.

It is a super-2 number, since 2×660123456² = 871525954322767872, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1838605 + ... + 1838963.

Almost surely, 2^660123456 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 660123456, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (895746240).

660123456 is an abundant number, since it is smaller than the sum of its proper divisors (1131369024).

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

660123456 is a wasteful number, since it uses less digits than its factorization.

660123456 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 592 (or 582 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 33.

The square root of 660123456 is about 25692.8678041203. The cubic root of 660123456 is about 870.7130526263.

The spelling of 660123456 in words is "six hundred sixty million, one hundred twenty-three thousand, four hundred fifty-six".