66725451 has 20 divisors (see below), whose sum is σ = 107345392. Its totient is φ = 41061168.

The previous prime is 66725437. The next prime is 66725453. The reversal of 66725451 is 15452766.

It is a happy number.

It is not a de Polignac number, because 66725451 - 2⁶ = 66725387 is a prime.

It is a super-2 number, since 2×66725451² = 8904571622306802, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66725453) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 30631 + ... + 32736.

Almost surely, 2^66725451 is an apocalyptic number.

66725451 is a deficient number, since it is larger than the sum of its proper divisors (40619941).

66725451 is a wasteful number, since it uses less digits than its factorization.

66725451 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63392 (or 63383 counting only the distinct ones).

The product of its digits is 50400, while the sum is 36.

The square root of 66725451 is about 8168.5648066230. The cubic root of 66725451 is about 405.5992774225.

It can be divided in two parts, 66725 and 451, that added together give a palindrome (67176).

The spelling of 66725451 in words is "sixty-six million, seven hundred twenty-five thousand, four hundred fifty-one".