66910725 has 144 divisors (see below), whose sum is σ = 152272000. Its totient is φ = 28788480.

The previous prime is 66910693. The next prime is 66910769. The reversal of 66910725 is 52701966.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

It is not a de Polignac number, because 66910725 - 2⁵ = 66910693 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 66910725.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 3935917 + ... + 3935933.

Almost surely, 2^66910725 is an apocalyptic number.

It is an amenable number.

66910725 is an abundant number, since it is smaller than the sum of its proper divisors (85361275).

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

66910725 is a wasteful number, since it uses less digits than its factorization.

66910725 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74 (or 32 counting only the distinct ones).

The product of its (nonzero) digits is 22680, while the sum is 36.

The square root of 66910725 is about 8179.8976154962. The cubic root of 66910725 is about 405.9743344854.

The spelling of 66910725 in words is "sixty-six million, nine hundred ten thousand, seven hundred twenty-five".