66415401 has 12 divisors (see below), whose sum is σ = 103313028. Its totient is φ = 40870944.

The previous prime is 66415373. The next prime is 66415463. The reversal of 66415401 is 10451466.

It can be written as a sum of positive squares in 2 ways, for example, as 13838400 + 52577001 = 3720^2 + 7251^2 .

It is not a de Polignac number, because 66415401 - 2⁵ = 66415369 is a prime.

It is a super-2 number, since 2×66415401² = 8822010979981602, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (66415001) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 283710 + ... + 283943.

It is an arithmetic number, because the mean of its divisors is an integer number (8609419).

Almost surely, 2^66415401 is an apocalyptic number.

It is an amenable number.

66415401 is a deficient number, since it is larger than the sum of its proper divisors (36897627).

66415401 is a wasteful number, since it uses less digits than its factorization.

66415401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 567672 (or 567669 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 27.

The square root of 66415401 is about 8149.5644668902. The cubic root of 66415401 is about 404.9700755211.

Adding to 66415401 its reverse (10451466), we get a palindrome (76866867).

The spelling of 66415401 in words is "sixty-six million, four hundred fifteen thousand, four hundred one".