66536040263 has 16 divisors (see below), whose sum is σ = 82977882624. Its totient is φ = 51831353760.

The previous prime is 66536040251. The next prime is 66536040269. The reversal of 66536040263 is 36204063566.

It is a cyclic number.

It is not a de Polignac number, because 66536040263 - 2⁴ = 66536040247 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 66536040263.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66536040269) 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, 149081 + ... + 394077.

It is an arithmetic number, because the mean of its divisors is an integer number (5186117664).

Almost surely, 2^66536040263 is an apocalyptic number.

66536040263 is a deficient number, since it is larger than the sum of its proper divisors (16441842361).

66536040263 is a wasteful number, since it uses less digits than its factorization.

66536040263 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 248542.

The product of its (nonzero) digits is 466560, while the sum is 41.

The spelling of 66536040263 in words is "sixty-six billion, five hundred thirty-six million, forty thousand, two hundred sixty-three".