66140360255 has 16 divisors (see below), whose sum is σ = 79826632704. Its totient is φ = 52606967040.

The previous prime is 66140360249. The next prime is 66140360311. The reversal of 66140360255 is 55206304166.

It is a happy number.

It is not a de Polignac number, because 66140360255 - 2¹⁸ = 66140098111 is a prime.

It is a super-2 number, since 2×66140360255² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5553467 + ... + 5565363.

It is an arithmetic number, because the mean of its divisors is an integer number (4989164544).

Almost surely, 2^66140360255 is an apocalyptic number.

66140360255 is a deficient number, since it is larger than the sum of its proper divisors (13686272449).

66140360255 is a wasteful number, since it uses less digits than its factorization.

66140360255 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18226.

The product of its (nonzero) digits is 129600, while the sum is 38.

The spelling of 66140360255 in words is "sixty-six billion, one hundred forty million, three hundred sixty thousand, two hundred fifty-five".