66620274215 has 16 divisors (see below), whose sum is σ = 90219307680. Its totient is φ = 46780379520.

The previous prime is 66620274211. The next prime is 66620274239. The reversal of 66620274215 is 51247202666.

66620274215 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 66620274215 - 2² = 66620274211 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66620274211) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20882504 + ... + 20885693.

It is an arithmetic number, because the mean of its divisors is an integer number (5638706730).

Almost surely, 2^66620274215 is an apocalyptic number.

66620274215 is a deficient number, since it is larger than the sum of its proper divisors (23599033465).

66620274215 is a wasteful number, since it uses less digits than its factorization.

66620274215 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41768242.

The product of its (nonzero) digits is 241920, while the sum is 41.

The spelling of 66620274215 in words is "sixty-six billion, six hundred twenty million, two hundred seventy-four thousand, two hundred fifteen".