66280155863 has 4 divisors (see below), whose sum is σ = 66899596680. Its totient is φ = 65660715048.

The previous prime is 66280155853. The next prime is 66280155881. The reversal of 66280155863 is 36855108266.

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 66280155863 - 2⁸ = 66280155607 is a prime.

It is a super-2 number, since 2×66280155863² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66280155853) 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, 309720248 + ... + 309720461.

It is an arithmetic number, because the mean of its divisors is an integer number (16724899170).

Almost surely, 2^66280155863 is an apocalyptic number.

66280155863 is a deficient number, since it is larger than the sum of its proper divisors (619440817).

66280155863 is a wasteful number, since it uses less digits than its factorization.

66280155863 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 619440816.

The product of its (nonzero) digits is 2073600, while the sum is 50.

The spelling of 66280155863 in words is "sixty-six billion, two hundred eighty million, one hundred fifty-five thousand, eight hundred sixty-three".