1216552141554 has 32 divisors (see below), whose sum is σ = 2462139789120. Its totient is φ = 400684416000.

The previous prime is 1216552141547. The next prime is 1216552141559. The reversal of 1216552141554 is 4551412556121.

It is a super-2 number, since 2×1216552141554² (a number of 25 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1216552141559) 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, 10207 + ... + 1559874.

It is an arithmetic number, because the mean of its divisors is an integer number (76941868410).

Almost surely, 2^{1216552141554} is an apocalyptic number.

1216552141554 is an abundant number, since it is smaller than the sum of its proper divisors (1245587647566).

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

1216552141554 is a wasteful number, since it uses less digits than its factorization.

1216552141554 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1571626.

The product of its digits is 240000, while the sum is 42.

Adding to 1216552141554 its reverse (4551412556121), we get a palindrome (5767964697675).

The spelling of 1216552141554 in words is "one trillion, two hundred sixteen billion, five hundred fifty-two million, one hundred forty-one thousand, five hundred fifty-four".