66515144432263 has 4 divisors (see below), whose sum is σ = 70427799987120. Its totient is φ = 62602488877408.

The previous prime is 66515144432251. The next prime is 66515144432273. The reversal of 66515144432263 is 36223444151566.

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

It is a cyclic number.

It is not a de Polignac number, because 66515144432263 - 2¹⁷ = 66515144301191 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 66515144432263.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66515144432273) 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, 1956327777403 + ... + 1956327777436.

It is an arithmetic number, because the mean of its divisors is an integer number (17606949996780).

Almost surely, 2^{66515144432263} is an apocalyptic number.

66515144432263 is a deficient number, since it is larger than the sum of its proper divisors (3912655554857).

66515144432263 is a wasteful number, since it uses less digits than its factorization.

66515144432263 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3912655554856.

The product of its digits is 12441600, while the sum is 52.

The spelling of 66515144432263 in words is "sixty-six trillion, five hundred fifteen billion, one hundred forty-four million, four hundred thirty-two thousand, two hundred sixty-three".