1218653001256 has 16 divisors (see below), whose sum is σ = 2284996289940. Its totient is φ = 609320657280.

The previous prime is 1218653001229. The next prime is 1218653001263. The reversal of 1218653001256 is 6521003568121.

It can be written as a sum of positive squares in 2 ways, for example, as 1216631060100 + 2021941156 = 1103010^2 + 44966^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 230260 + ... + 1578076.

Almost surely, 2^{1218653001256} is an apocalyptic number.

It is an amenable number.

1218653001256 is a deficient number, since it is larger than the sum of its proper divisors (1066343288684).

1218653001256 is a wasteful number, since it uses less digits than its factorization.

1218653001256 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1460844 (or 1460840 counting only the distinct ones).

The product of its (nonzero) digits is 86400, while the sum is 40.

Adding to 1218653001256 its reverse (6521003568121), we get a palindrome (7739656569377).

The spelling of 1218653001256 in words is "one trillion, two hundred eighteen billion, six hundred fifty-three million, one thousand, two hundred fifty-six".