1218674749550 has 12 divisors (see below), whose sum is σ = 2266735034256. Its totient is φ = 487469899800.

The previous prime is 1218674749549. The next prime is 1218674749559. The reversal of 1218674749550 is 559474768121.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 1218674749550.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1218674749559) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 12186747446 + ... + 12186747545.

It is an arithmetic number, because the mean of its divisors is an integer number (188894586188).

Almost surely, 2^{1218674749550} is an apocalyptic number.

1218674749550 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1218674749550 is a deficient number, since it is larger than the sum of its proper divisors (1048060284706).

1218674749550 is a wasteful number, since it uses less digits than its factorization.

1218674749550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24373495003 (or 24373494998 counting only the distinct ones).

The product of its (nonzero) digits is 16934400, while the sum is 59.

The spelling of 1218674749550 in words is "one trillion, two hundred eighteen billion, six hundred seventy-four million, seven hundred forty-nine thousand, five hundred fifty".