127787497818 has 64 divisors (see below), whose sum is σ = 276117811200. Its totient is φ = 39305407680.

The previous prime is 127787497807. The next prime is 127787497909. The reversal of 127787497818 is 818794787721.

It is a super-2 number, since 2×127787497818² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (69).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4913493 + ... + 4939431.

It is an arithmetic number, because the mean of its divisors is an integer number (4314340800).

Almost surely, 2^127787497818 is an apocalyptic number.

127787497818 is an abundant number, since it is smaller than the sum of its proper divisors (148330313382).

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

127787497818 is a wasteful number, since it uses less digits than its factorization.

127787497818 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27227.

The product of its digits is 88510464, while the sum is 69.

The spelling of 127787497818 in words is "one hundred twenty-seven billion, seven hundred eighty-seven million, four hundred ninety-seven thousand, eight hundred eighteen".