1218717772428 has 48 divisors (see below), whose sum is σ = 3195567680256. Its totient is φ = 358686166080.

The previous prime is 1218717772423. The next prime is 1218717772453. The reversal of 1218717772428 is 8242777178121.

It is not an unprimeable number, because it can be changed into a prime (1218717772423) 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, 169828878 + ... + 169836053.

It is an arithmetic number, because the mean of its divisors is an integer number (66574326672).

Almost surely, 2^{1218717772428} is an apocalyptic number.

It is an amenable number.

1218717772428 is an abundant number, since it is smaller than the sum of its proper divisors (1976849907828).

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

1218717772428 is a wasteful number, since it uses less digits than its factorization.

1218717772428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 339664974 (or 339664972 counting only the distinct ones).

The product of its digits is 4917248, while the sum is 57.

The spelling of 1218717772428 in words is "one trillion, two hundred eighteen billion, seven hundred seventeen million, seven hundred seventy-two thousand, four hundred twenty-eight".