666153774 has 128 divisors (see below), whose sum is σ = 1751016960. Its totient is φ = 185068800.

The previous prime is 666153769. The next prime is 666153781. The reversal of 666153774 is 477351666.

It is a super-2 number, since 2×666153774² = 887521701228886152, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 2169729 + ... + 2170035.

It is an arithmetic number, because the mean of its divisors is an integer number (13679820).

Almost surely, 2^666153774 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 666153774, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (875508480).

666153774 is an abundant number, since it is smaller than the sum of its proper divisors (1084863186).

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

666153774 is a wasteful number, since it uses less digits than its factorization.

666153774 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 623 (or 617 counting only the distinct ones).

The product of its digits is 635040, while the sum is 45.

The square root of 666153774 is about 25809.9549399064. The cubic root of 666153774 is about 873.3563807539.

The spelling of 666153774 in words is "six hundred sixty-six million, one hundred fifty-three thousand, seven hundred seventy-four".