1216054401653 has 16 divisors (see below), whose sum is σ = 1496711682816. Its totient is φ = 962134070400.

The previous prime is 1216054401647. The next prime is 1216054401659. The reversal of 1216054401653 is 3561044506121.

It is an interprime number because it is at equal distance from previous prime (1216054401647) and next prime (1216054401659).

It is a cyclic number.

It is not a de Polignac number, because 1216054401653 - 2³² = 1211759434357 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1216054401659) 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, 6217553 + ... + 6410153.

It is an arithmetic number, because the mean of its divisors is an integer number (93544480176).

Almost surely, 2^{1216054401653} is an apocalyptic number.

1216054401653 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

1216054401653 is a deficient number, since it is larger than the sum of its proper divisors (280657281163).

1216054401653 is a wasteful number, since it uses less digits than its factorization.

1216054401653 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 262004.

The product of its (nonzero) digits is 86400, while the sum is 38.

Adding to 1216054401653 its reverse (3561044506121), we get a palindrome (4777098907774).

The spelling of 1216054401653 in words is "one trillion, two hundred sixteen billion, fifty-four million, four hundred one thousand, six hundred fifty-three".