18742047277 has 2 divisors, whose sum is σ = 18742047278. Its totient is φ = 18742047276.

The previous prime is 18742047221. The next prime is 18742047319. The reversal of 18742047277 is 77274024781.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14973437956 + 3768609321 = 122366^2 + 61389^2 .

It is a cyclic number.

It is not a de Polignac number, because 18742047277 - 2¹⁵ = 18742014509 is a prime.

It is a super-2 number, since 2×18742047277² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 18742047277.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18742045277) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9371023638 + 9371023639.

It is an arithmetic number, because the mean of its divisors is an integer number (9371023639).

Almost surely, 2^18742047277 is an apocalyptic number.

It is an amenable number.

18742047277 is a deficient number, since it is larger than the sum of its proper divisors (1).

18742047277 is an equidigital number, since it uses as much as digits as its factorization.

18742047277 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1229312, while the sum is 49.

The spelling of 18742047277 in words is "eighteen billion, seven hundred forty-two million, forty-seven thousand, two hundred seventy-seven".