66801915 has 64 divisors (see below), whose sum is σ = 123984000. Its totient is φ = 34525440.

The previous prime is 66801907. The next prime is 66801937. The reversal of 66801915 is 51910866.

It is not a de Polignac number, because 66801915 - 2³ = 66801907 is a prime.

It is a zygodrome in base 3.

It is a self number, because there is not a number n which added to its sum of digits gives 66801915.

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, 448261 + ... + 448409.

It is an arithmetic number, because the mean of its divisors is an integer number (1937250).

Almost surely, 2^66801915 is an apocalyptic number.

66801915 is a deficient number, since it is larger than the sum of its proper divisors (57182085).

66801915 is an equidigital number, since it uses as much as digits as its factorization.

66801915 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 216 (or 198 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 36.

The square root of 66801915 is about 8173.2438480691. The cubic root of 66801915 is about 405.7541503807.

The spelling of 66801915 in words is "sixty-six million, eight hundred one thousand, nine hundred fifteen".