66086405 has 16 divisors (see below), whose sum is σ = 98872704. Its totient is φ = 41196480.

The previous prime is 66086393. The next prime is 66086407. The reversal of 66086405 is 50468066.

It is not a de Polignac number, because 66086405 - 2⁶ = 66086341 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (35).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66086407) 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, 85442 + ... + 86211.

It is an arithmetic number, because the mean of its divisors is an integer number (6179544).

Almost surely, 2^66086405 is an apocalyptic number.

It is an amenable number.

66086405 is a deficient number, since it is larger than the sum of its proper divisors (32786299).

66086405 is a wasteful number, since it uses less digits than its factorization.

66086405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 171676.

The product of its (nonzero) digits is 34560, while the sum is 35.

The square root of 66086405 is about 8129.3545254221. The cubic root of 66086405 is about 404.3002803829.

The spelling of 66086405 in words is "sixty-six million, eighty-six thousand, four hundred five".