66415426 has 16 divisors (see below), whose sum is σ = 124205760. Its totient is φ = 25876080.

The previous prime is 66415373. The next prime is 66415463. The reversal of 66415426 is 62451466.

It is a super-2 number, since 2×66415426² = 8822017621522952, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 66415391 and 66415400.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 215481 + ... + 215788.

It is an arithmetic number, because the mean of its divisors is an integer number (7762860).

Almost surely, 2^66415426 is an apocalyptic number.

66415426 is a deficient number, since it is larger than the sum of its proper divisors (57790334).

66415426 is a wasteful number, since it uses less digits than its factorization.

66415426 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 431289.

The product of its digits is 34560, while the sum is 34.

The square root of 66415426 is about 8149.5660007144. The cubic root of 66415426 is about 404.9701263338.

The spelling of 66415426 in words is "sixty-six million, four hundred fifteen thousand, four hundred twenty-six".