66426531 has 16 divisors (see below), whose sum is σ = 93965184. Its totient is φ = 41596544.

The previous prime is 66426491. The next prime is 66426551. The reversal of 66426531 is 13562466.

It is a cyclic number.

It is not a de Polignac number, because 66426531 - 2⁶ = 66426467 is a prime.

It is a super-2 number, since 2×66426531² = 8824968041387922, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 66426492 and 66426501.

It is not an unprimeable number, because it can be changed into a prime (66426551) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 33880 + ... + 35786.

It is an arithmetic number, because the mean of its divisors is an integer number (5872824).

Almost surely, 2^66426531 is an apocalyptic number.

66426531 is a deficient number, since it is larger than the sum of its proper divisors (27538653).

66426531 is a wasteful number, since it uses less digits than its factorization.

66426531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2610.

The product of its digits is 25920, while the sum is 33.

The square root of 66426531 is about 8150.2472968616. The cubic root of 66426531 is about 404.9926961036.

Adding to 66426531 its reverse (13562466), we get a palindrome (79988997).

The spelling of 66426531 in words is "sixty-six million, four hundred twenty-six thousand, five hundred thirty-one".