66441725 has 12 divisors (see below), whose sum is σ = 94157664. Its totient is φ = 45559920.

The previous prime is 66441719. The next prime is 66441731. The reversal of 66441725 is 52714466.

It is an interprime number because it is at equal distance from previous prime (66441719) and next prime (66441731).

It is not a de Polignac number, because 66441725 - 2⁸ = 66441469 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (35).

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 189659 + ... + 190008.

It is an arithmetic number, because the mean of its divisors is an integer number (7846472).

Almost surely, 2^66441725 is an apocalyptic number.

It is an amenable number.

66441725 is a deficient number, since it is larger than the sum of its proper divisors (27715939).

66441725 is a wasteful number, since it uses less digits than its factorization.

66441725 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 379684 (or 379679 counting only the distinct ones).

The product of its digits is 40320, while the sum is 35.

The square root of 66441725 is about 8151.1793625217. The cubic root of 66441725 is about 405.0235722702.

The spelling of 66441725 in words is "sixty-six million, four hundred forty-one thousand, seven hundred twenty-five".