123871718778 has 32 divisors (see below), whose sum is σ = 253535732736. Its totient is φ = 40325424048.

The previous prime is 123871718689. The next prime is 123871718779. The reversal of 123871718778 is 877817178321.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (123871718779) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2531775 + ... + 2580237.

It is an arithmetic number, because the mean of its divisors is an integer number (7922991648).

Almost surely, 2^123871718778 is an apocalyptic number.

123871718778 is an abundant number, since it is smaller than the sum of its proper divisors (129664013958).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

123871718778 is a wasteful number, since it uses less digits than its factorization.

123871718778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58418.

The product of its digits is 7375872, while the sum is 60.

The spelling of 123871718778 in words is "one hundred twenty-three billion, eight hundred seventy-one million, seven hundred eighteen thousand, seven hundred seventy-eight".