66136469 has 4 divisors (see below), whose sum is σ = 75584544. Its totient is φ = 56688396.

The previous prime is 66136459. The next prime is 66136471. The reversal of 66136469 is 96463166.

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 66136469 - 2¹² = 66132373 is a prime.

It is a super-2 number, since 2×66136469² = 8748065063575922, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66136459) 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, 4724027 + ... + 4724040.

It is an arithmetic number, because the mean of its divisors is an integer number (18896136).

Almost surely, 2^66136469 is an apocalyptic number.

It is an amenable number.

66136469 is a deficient number, since it is larger than the sum of its proper divisors (9448075).

66136469 is an equidigital number, since it uses as much as digits as its factorization.

66136469 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9448074.

The product of its digits is 139968, while the sum is 41.

The square root of 66136469 is about 8132.4331537370. The cubic root of 66136469 is about 404.4023476699.

The spelling of 66136469 in words is "sixty-six million, one hundred thirty-six thousand, four hundred sixty-nine".