66401024 has 18 divisors (see below), whose sum is σ = 132543180. Its totient is φ = 33200384.

The previous prime is 66401011. The next prime is 66401053. The reversal of 66401024 is 42010466.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 129434 + ... + 129945.

It is an arithmetic number, because the mean of its divisors is an integer number (7363510).

Almost surely, 2^66401024 is an apocalyptic number.

66401024 is a gapful number since it is divisible by the number (64) formed by its first and last digit.

It is an amenable number.

66401024 is a deficient number, since it is larger than the sum of its proper divisors (66142156).

66401024 is an equidigital number, since it uses as much as digits as its factorization.

66401024 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 259395 (or 259381 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 23.

The square root of 66401024 is about 8148.6823474719. The cubic root of 66401024 is about 404.9408520033.

The spelling of 66401024 in words is "sixty-six million, four hundred one thousand, twenty-four".