1218674749551 has 16 divisors (see below), whose sum is σ = 1861659195648. Its totient is φ = 694648944000.

The previous prime is 1218674749549. The next prime is 1218674749559. The reversal of 1218674749551 is 1559474768121.

It is a happy number.

It is not a de Polignac number, because 1218674749551 - 2¹ = 1218674749549 is a prime.

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 15 ways as a sum of consecutive naturals, for example, 72350845 + ... + 72367686.

It is an arithmetic number, because the mean of its divisors is an integer number (116353699728).

Almost surely, 2^{1218674749551} is an apocalyptic number.

1218674749551 is a deficient number, since it is larger than the sum of its proper divisors (642984446097).

1218674749551 is a wasteful number, since it uses less digits than its factorization.

1218674749551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 144718942.

The product of its digits is 16934400, while the sum is 60.

The spelling of 1218674749551 in words is "one trillion, two hundred eighteen billion, six hundred seventy-four million, seven hundred forty-nine thousand, five hundred fifty-one".