66061215 has 48 divisors (see below), whose sum is σ = 125607456. Its totient is φ = 31852800.

The previous prime is 66061211. The next prime is 66061223. The reversal of 66061215 is 51216066.

It is a happy number.

It is not a de Polignac number, because 66061215 - 2² = 66061211 is a prime.

It is a zygodrome in base 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66061211) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 156705 + ... + 157125.

It is an arithmetic number, because the mean of its divisors is an integer number (2616822).

Almost surely, 2^66061215 is an apocalyptic number.

66061215 is a deficient number, since it is larger than the sum of its proper divisors (59546241).

66061215 is a wasteful number, since it uses less digits than its factorization.

66061215 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 760 (or 757 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 27.

The square root of 66061215 is about 8127.8050542567. The cubic root of 66061215 is about 404.2489051249.

The spelling of 66061215 in words is "sixty-six million, sixty-one thousand, two hundred fifteen".