66540277299 has 4 divisors (see below), whose sum is σ = 88720369736. Its totient is φ = 44360184864.

The previous prime is 66540277291. The next prime is 66540277381. The reversal of 66540277299 is 99277204566.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 66540277299 - 2³ = 66540277291 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66540277291) 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, 11090046214 + ... + 11090046219.

It is an arithmetic number, because the mean of its divisors is an integer number (22180092434).

Almost surely, 2^66540277299 is an apocalyptic number.

66540277299 is a deficient number, since it is larger than the sum of its proper divisors (22180092437).

66540277299 is a wasteful number, since it uses less digits than its factorization.

66540277299 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22180092436.

The product of its (nonzero) digits is 11430720, while the sum is 57.

The spelling of 66540277299 in words is "sixty-six billion, five hundred forty million, two hundred seventy-seven thousand, two hundred ninety-nine".