66665266983 has 24 divisors (see below), whose sum is σ = 110442267936. Its totient is φ = 37958860800.

The previous prime is 66665266949. The next prime is 66665267017. The reversal of 66665266983 is 38966256666.

It is an interprime number because it is at equal distance from previous prime (66665266949) and next prime (66665267017).

It is not a de Polignac number, because 66665266983 - 2⁶ = 66665266919 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a self number, because there is not a number n which added to its sum of digits gives 66665266983.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66665267983) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1865178 + ... + 1900583.

It is an arithmetic number, because the mean of its divisors is an integer number (4601761164).

Almost surely, 2^66665266983 is an apocalyptic number.

66665266983 is a gapful number since it is divisible by the number (63) formed by its first and last digit.

66665266983 is a deficient number, since it is larger than the sum of its proper divisors (43777000953).

66665266983 is a wasteful number, since it uses less digits than its factorization.

66665266983 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3766055 (or 3766052 counting only the distinct ones).

The product of its digits is 100776960, while the sum is 63.

The spelling of 66665266983 in words is "sixty-six billion, six hundred sixty-five million, two hundred sixty-six thousand, nine hundred eighty-three".