123456777897 has 16 divisors (see below), whose sum is σ = 166695217920. Its totient is φ = 81262654032.

The previous prime is 123456777893. The next prime is 123456777911. The reversal of 123456777897 is 798777654321.

It is not a de Polignac number, because 123456777897 - 2² = 123456777893 is a prime.

It is not an unprimeable number, because it can be changed into a prime (123456777893) 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, 252754 + ... + 557492.

It is an arithmetic number, because the mean of its divisors is an integer number (10418451120).

Almost surely, 2^123456777897 is an apocalyptic number.

It is an amenable number.

123456777897 is a deficient number, since it is larger than the sum of its proper divisors (43238440023).

123456777897 is a wasteful number, since it uses less digits than its factorization.

123456777897 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 306452.

The product of its digits is 124467840, while the sum is 66.

The spelling of 123456777897 in words is "one hundred twenty-three billion, four hundred fifty-six million, seven hundred seventy-seven thousand, eight hundred ninety-seven".