665524532150640 has 160 divisors (see below), whose sum is σ = 2292957261253440. Its totient is φ = 177427145309184.

The previous prime is 665524532150633. The next prime is 665524532150657. The reversal of 665524532150640 is 46051235425566.

665524532150640 is a `hidden beast` number, since 6 + 6 + 5 + 5 + 24 + 53 + 21 + 506 + 40 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 31661067 + ... + 48306026.

It is an arithmetic number, because the mean of its divisors is an integer number (14330982882834).

Almost surely, 2^{665524532150640} is an apocalyptic number.

665524532150640 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

665524532150640 is an abundant number, since it is smaller than the sum of its proper divisors (1627432729102800).

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

665524532150640 is a wasteful number, since it uses less digits than its factorization.

665524532150640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79970968 (or 79970956 counting only the distinct ones).

The product of its (nonzero) digits is 25920000, while the sum is 54.

The spelling of 665524532150640 in words is "six hundred sixty-five trillion, five hundred twenty-four billion, five hundred thirty-two million, one hundred fifty thousand, six hundred forty".