66829725 has 48 divisors (see below), whose sum is σ = 123672640. Its totient is φ = 35380800.

The previous prime is 66829699. The next prime is 66829751. The reversal of 66829725 is 52792866.

It is an interprime number because it is at equal distance from previous prime (66829699) and next prime (66829751).

It is not a de Polignac number, because 66829725 - 2⁷ = 66829597 is a prime.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 121902 + ... + 122448.

Almost surely, 2^66829725 is an apocalyptic number.

It is an amenable number.

66829725 is a deficient number, since it is larger than the sum of its proper divisors (56842915).

66829725 is a wasteful number, since it uses less digits than its factorization.

66829725 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 747 (or 736 counting only the distinct ones).

The product of its digits is 362880, while the sum is 45.

The square root of 66829725 is about 8174.9449539431. The cubic root of 66829725 is about 405.8104484545.

The spelling of 66829725 in words is "sixty-six million, eight hundred twenty-nine thousand, seven hundred twenty-five".