18827241577 has 4 divisors (see below), whose sum is σ = 18964666836. Its totient is φ = 18689816320.

The previous prime is 18827241553. The next prime is 18827241581. The reversal of 18827241577 is 77514272881.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 77514272881 = 135019 ⋅574099.

It can be written as a sum of positive squares in 2 ways, for example, as 12566634201 + 6260607376 = 112101^2 + 79124^2 .

It is a cyclic number.

It is not a de Polignac number, because 18827241577 - 2⁷ = 18827241449 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18827241677) 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, 68712424 + ... + 68712697.

It is an arithmetic number, because the mean of its divisors is an integer number (4741166709).

Almost surely, 2^18827241577 is an apocalyptic number.

It is an amenable number.

18827241577 is a deficient number, since it is larger than the sum of its proper divisors (137425259).

18827241577 is a wasteful number, since it uses less digits than its factorization.

18827241577 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 137425258.

The product of its digits is 1756160, while the sum is 52.

The spelling of 18827241577 in words is "eighteen billion, eight hundred twenty-seven million, two hundred forty-one thousand, five hundred seventy-seven".