66426613 has 4 divisors (see below), whose sum is σ = 72465408. Its totient is φ = 60387820.

The previous prime is 66426587. The next prime is 66426623. The reversal of 66426613 is 31662466.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 66426613 - 2¹³ = 66418421 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66426623) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3019381 + ... + 3019402.

It is an arithmetic number, because the mean of its divisors is an integer number (18116352).

Almost surely, 2^66426613 is an apocalyptic number.

It is an amenable number.

66426613 is a deficient number, since it is larger than the sum of its proper divisors (6038795).

66426613 is a wasteful number, since it uses less digits than its factorization.

66426613 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6038794.

The product of its digits is 31104, while the sum is 34.

The square root of 66426613 is about 8150.2523273823. The cubic root of 66426613 is about 404.9928627508.

The spelling of 66426613 in words is "sixty-six million, four hundred twenty-six thousand, six hundred thirteen".