665152020 has 192 divisors, whose sum is σ = 2283886080. Its totient is φ = 159667200.

The previous prime is 665152001. The next prime is 665152031. The reversal of 665152020 is 20251566.

665152020 is a `hidden beast` number, since 6 + 651 + 5 + 2 + 0 + 2 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

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, 286665 + ... + 288975.

It is an arithmetic number, because the mean of its divisors is an integer number (11895240).

Almost surely, 2^665152020 is an apocalyptic number.

665152020 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 665152020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1141943040).

665152020 is an abundant number, since it is smaller than the sum of its proper divisors (1618734060).

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

665152020 is a wasteful number, since it uses less digits than its factorization.

665152020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2383 (or 2375 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 27.

The square root of 665152020 is about 25790.5412893952. The cubic root of 665152020 is about 872.9183802013.

The spelling of 665152020 in words is "six hundred sixty-five million, one hundred fifty-two thousand, twenty".