123777777871 has 4 divisors (see below), whose sum is σ = 135030303144. Its totient is φ = 112525252600.

The previous prime is 123777777859. The next prime is 123777777883. The reversal of 123777777871 is 178777777321.

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

It is an interprime number because it is at equal distance from previous prime (123777777859) and next prime (123777777883).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-123777777871 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123777777811) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5626262620 + ... + 5626262641.

It is an arithmetic number, because the mean of its divisors is an integer number (33757575786).

Almost surely, 2^123777777871 is an apocalyptic number.

123777777871 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

123777777871 is a deficient number, since it is larger than the sum of its proper divisors (11252525273).

123777777871 is a wasteful number, since it uses less digits than its factorization.

123777777871 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11252525272.

The product of its digits is 39530064, while the sum is 64.

The spelling of 123777777871 in words is "one hundred twenty-three billion, seven hundred seventy-seven million, seven hundred seventy-seven thousand, eight hundred seventy-one".