66457144 has 16 divisors (see below), whose sum is σ = 134192520. Its totient is φ = 30672480.

The previous prime is 66457141. The next prime is 66457147. The reversal of 66457144 is 44175466.

It is an interprime number because it is at equal distance from previous prime (66457141) and next prime (66457147).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66457141) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 319402 + ... + 319609.

Almost surely, 2^66457144 is an apocalyptic number.

It is an amenable number.

66457144 is an abundant number, since it is smaller than the sum of its proper divisors (67735376).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

66457144 is a wasteful number, since it uses less digits than its factorization.

66457144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 639030 (or 639026 counting only the distinct ones).

The product of its digits is 80640, while the sum is 37.

The square root of 66457144 is about 8152.1251217091. The cubic root of 66457144 is about 405.0549008539.

The spelling of 66457144 in words is "sixty-six million, four hundred fifty-seven thousand, one hundred forty-four".