66134364557 has 4 divisors (see below), whose sum is σ = 66137180256. Its totient is φ = 66131548860.

The previous prime is 66134364539. The next prime is 66134364577. The reversal of 66134364557 is 75546343166.

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 66134364557 - 2²⁶ = 66067255693 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 (66134364577) 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, 1372319 + ... + 1419692.

It is an arithmetic number, because the mean of its divisors is an integer number (16534295064).

Almost surely, 2^66134364557 is an apocalyptic number.

It is an amenable number.

66134364557 is a deficient number, since it is larger than the sum of its proper divisors (2815699).

66134364557 is a wasteful number, since it uses less digits than its factorization.

66134364557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2815698.

The product of its digits is 5443200, while the sum is 50.

The spelling of 66134364557 in words is "sixty-six billion, one hundred thirty-four million, three hundred sixty-four thousand, five hundred fifty-seven".