66371221320225 has 48 divisors (see below), whose sum is σ = 116329175224128. Its totient is φ = 33275464714240.

The previous prime is 66371221320121. The next prime is 66371221320281. The reversal of 66371221320225 is 52202312217366.

It is not a de Polignac number, because 66371221320225 - 2²⁹ = 66370684449313 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 30418284 + ... + 32527133.

It is an arithmetic number, because the mean of its divisors is an integer number (2423524483836).

Almost surely, 2^{66371221320225} is an apocalyptic number.

It is an amenable number.

66371221320225 is a deficient number, since it is larger than the sum of its proper divisors (49957953903903).

66371221320225 is a wasteful number, since it uses less digits than its factorization.

66371221320225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62946274 (or 62946269 counting only the distinct ones).

The product of its (nonzero) digits is 362880, while the sum is 42.

The spelling of 66371221320225 in words is "sixty-six trillion, three hundred seventy-one billion, two hundred twenty-one million, three hundred twenty thousand, two hundred twenty-five".