18776136897 has 48 divisors (see below), whose sum is σ = 32837156352. Its totient is φ = 10092441600.

The previous prime is 18776136887. The next prime is 18776136923. The reversal of 18776136897 is 79863167781.

18776136897 is a `hidden beast` number, since 1 + 8 + 7 + 7 + 613 + 6 + 8 + 9 + 7 = 666.

It is not a de Polignac number, because 18776136897 - 2⁴ = 18776136881 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is not an unprimeable number, because it can be changed into a prime (18776136817) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2514193 + ... + 2521649.

It is an arithmetic number, because the mean of its divisors is an integer number (684107424).

Almost surely, 2^18776136897 is an apocalyptic number.

18776136897 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

It is an amenable number.

18776136897 is a deficient number, since it is larger than the sum of its proper divisors (14061019455).

18776136897 is a wasteful number, since it uses less digits than its factorization.

18776136897 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9838 (or 9835 counting only the distinct ones).

The product of its digits is 21337344, while the sum is 63.

The spelling of 18776136897 in words is "eighteen billion, seven hundred seventy-six million, one hundred thirty-six thousand, eight hundred ninety-seven".