18406586677 has 2 divisors, whose sum is σ = 18406586678. Its totient is φ = 18406586676.

The previous prime is 18406586663. The next prime is 18406586701. The reversal of 18406586677 is 77668560481.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10131227716 + 8275358961 = 100654^2 + 90969^2 .

It is an emirp because it is prime and its reverse (77668560481) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18406586677 - 2¹⁵ = 18406553909 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18406583677) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9203293338 + 9203293339.

It is an arithmetic number, because the mean of its divisors is an integer number (9203293339).

Almost surely, 2^18406586677 is an apocalyptic number.

It is an amenable number.

18406586677 is a deficient number, since it is larger than the sum of its proper divisors (1).

18406586677 is an equidigital number, since it uses as much as digits as its factorization.

18406586677 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 13547520, while the sum is 58.

The spelling of 18406586677 in words is "eighteen billion, four hundred six million, five hundred eighty-six thousand, six hundred seventy-seven".