66457628128525 has 12 divisors (see below), whose sum is σ = 82408400065504. Its totient is φ = 53165495286000.

The previous prime is 66457628128457. The next prime is 66457628128537. The reversal of 66457628128525 is 52582182675466.

It is not a de Polignac number, because 66457628128525 - 2⁹ = 66457628128013 is a prime.

It is a super-3 number, since 3×66457628128525³ (a number of 42 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 12941241 + ... + 17331790.

Almost surely, 2^{66457628128525} is an apocalyptic number.

It is an amenable number.

66457628128525 is a deficient number, since it is larger than the sum of its proper divisors (15950771936979).

66457628128525 is a wasteful number, since it uses less digits than its factorization.

66457628128525 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30360852 (or 30360847 counting only the distinct ones).

The product of its digits is 387072000, while the sum is 67.

The spelling of 66457628128525 in words is "sixty-six trillion, four hundred fifty-seven billion, six hundred twenty-eight million, one hundred twenty-eight thousand, five hundred twenty-five".