665970240 has 448 divisors, whose sum is σ = 2500920576. Its totient is φ = 148635648.

The previous prime is 665970211. The next prime is 665970259. The reversal of 665970240 is 42079566.

It is a hoax number, since the sum of its digits (39) 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 (39).

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 9122844 + ... + 9122916.

It is an arithmetic number, because the mean of its divisors is an integer number (5582412).

Almost surely, 2^665970240 is an apocalyptic number.

665970240 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 665970240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1250460288).

665970240 is an abundant number, since it is smaller than the sum of its proper divisors (1834950336).

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

665970240 is a wasteful number, since it uses less digits than its factorization.

665970240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 166 (or 156 counting only the distinct ones).

The product of its (nonzero) digits is 90720, while the sum is 39.

The square root of 665970240 is about 25806.3992063984. The cubic root of 665970240 is about 873.2761663854.

The spelling of 665970240 in words is "six hundred sixty-five million, nine hundred seventy thousand, two hundred forty".