666535464 has 192 divisors, whose sum is σ = 2189091840. Its totient is φ = 179159040.

The previous prime is 666535451. The next prime is 666535477. The reversal of 666535464 is 464535666.

It is an interprime number because it is at equal distance from previous prime (666535451) and next prime (666535477).

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 577512 + ... + 578664.

It is an arithmetic number, because the mean of its divisors is an integer number (11401520).

Almost surely, 2^666535464 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 666535464, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1094545920).

666535464 is an abundant number, since it is smaller than the sum of its proper divisors (1522556376).

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

666535464 is a wasteful number, since it uses less digits than its factorization.

666535464 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1240 (or 1233 counting only the distinct ones).

The product of its digits is 1555200, while the sum is 45.

The square root of 666535464 is about 25817.3481209825. The cubic root of 666535464 is about 873.5231529331.

It can be divided in two parts, 666 and 535464, that added together give a triangular number (536130 = T₁₀₃₅).

The spelling of 666535464 in words is "six hundred sixty-six million, five hundred thirty-five thousand, four hundred sixty-four".