66418726 has 16 divisors (see below), whose sum is σ = 109744128. Its totient is φ = 29896200.

The previous prime is 66418721. The next prime is 66418727. The reversal of 66418726 is 62781466.

It is a super-2 number, since 2×66418726² = 8822894326926152, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66418721) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12390 + ... + 16921.

It is an arithmetic number, because the mean of its divisors is an integer number (6859008).

Almost surely, 2^66418726 is an apocalyptic number.

66418726 is a deficient number, since it is larger than the sum of its proper divisors (43325402).

66418726 is a wasteful number, since it uses less digits than its factorization.

66418726 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29427.

The product of its digits is 96768, while the sum is 40.

The square root of 66418726 is about 8149.7684629687. The cubic root of 66418726 is about 404.9768335070.

The spelling of 66418726 in words is "sixty-six million, four hundred eighteen thousand, seven hundred twenty-six".