66431901 has 12 divisors (see below), whose sum is σ = 89188736. Its totient is φ = 43983480.

The previous prime is 66431879. The next prime is 66431917. The reversal of 66431901 is 10913466.

It is not a de Polignac number, because 66431901 - 2⁹ = 66431389 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66431921) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 109140 + ... + 109746.

Almost surely, 2^66431901 is an apocalyptic number.

It is an amenable number.

66431901 is a deficient number, since it is larger than the sum of its proper divisors (22756835).

66431901 is an equidigital number, since it uses as much as digits as its factorization.

66431901 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 992 (or 801 counting only the distinct ones).

The product of its (nonzero) digits is 3888, while the sum is 30.

The square root of 66431901 is about 8150.5767280604. The cubic root of 66431901 is about 405.0036091738.

The spelling of 66431901 in words is "sixty-six million, four hundred thirty-one thousand, nine hundred one".