66877777916919 has 12 divisors (see below), whose sum is σ = 96601472509776. Its totient is φ = 44585075551392.

The previous prime is 66877777916893. The next prime is 66877777916993. The reversal of 66877777916919 is 91961977777866.

It is not a de Polignac number, because 66877777916919 - 2¹⁹ = 66877777392631 is a prime.

It is a super-2 number, since 2×66877777916919² (a number of 28 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66877777914919) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5193942 + ... + 12678035.

It is an arithmetic number, because the mean of its divisors is an integer number (8050122709148).

Almost surely, 2^{66877777916919} is an apocalyptic number.

66877777916919 is a deficient number, since it is larger than the sum of its proper divisors (29723694592857).

66877777916919 is a wasteful number, since it uses less digits than its factorization.

66877777916919 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18287766 (or 18287763 counting only the distinct ones).

The product of its digits is 21171979584, while the sum is 90.

The spelling of 66877777916919 in words is "sixty-six trillion, eight hundred seventy-seven billion, seven hundred seventy-seven million, nine hundred sixteen thousand, nine hundred nineteen".