66901121 has 8 divisors (see below), whose sum is σ = 78019200. Its totient is φ = 57343524.

The previous prime is 66901097. The next prime is 66901123. The reversal of 66901121 is 12110966.

It is not a de Polignac number, because 66901121 - 2¹⁸ = 66638977 is a prime.

It is not an unprimeable number, because it can be changed into a prime (66901123) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 97181 + ... + 97866.

It is an arithmetic number, because the mean of its divisors is an integer number (9752400).

Almost surely, 2^66901121 is an apocalyptic number.

It is an amenable number.

66901121 is a deficient number, since it is larger than the sum of its proper divisors (11118079).

66901121 is an equidigital number, since it uses as much as digits as its factorization.

66901121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 195068 (or 195054 counting only the distinct ones).

The product of its (nonzero) digits is 648, while the sum is 26.

The square root of 66901121 is about 8179.3105455167. The cubic root of 66901121 is about 405.9549097765.

The spelling of 66901121 in words is "sixty-six million, nine hundred one thousand, one hundred twenty-one".