18772814077 has 4 divisors (see below), whose sum is σ = 19877097276. Its totient is φ = 17668530880.

The previous prime is 18772814041. The next prime is 18772814083. The reversal of 18772814077 is 77041827781.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 11128984036 + 7643830041 = 105494^2 + 87429^2 .

It is a cyclic number.

It is not a de Polignac number, because 18772814077 - 2⁷ = 18772813949 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18772812077) 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, 552141574 + ... + 552141607.

It is an arithmetic number, because the mean of its divisors is an integer number (4969274319).

Almost surely, 2^18772814077 is an apocalyptic number.

18772814077 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

It is an amenable number.

18772814077 is a deficient number, since it is larger than the sum of its proper divisors (1104283199).

18772814077 is a wasteful number, since it uses less digits than its factorization.

18772814077 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1104283198.

The product of its (nonzero) digits is 1229312, while the sum is 52.

The spelling of 18772814077 in words is "eighteen billion, seven hundred seventy-two million, eight hundred fourteen thousand, seventy-seven".