11554155151621 has 2 divisors, whose sum is σ = 11554155151622. Its totient is φ = 11554155151620.

The previous prime is 11554155151597. The next prime is 11554155151633. The reversal of 11554155151621 is 12615155145511.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10728081390625 + 826073760996 = 3275375^2 + 908886^2 .

It is a cyclic number.

It is not a de Polignac number, because 11554155151621 - 2¹⁵ = 11554155118853 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11554155151661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5777077575810 + 5777077575811.

It is an arithmetic number, because the mean of its divisors is an integer number (5777077575811).

Almost surely, 2^{11554155151621} is an apocalyptic number.

It is an amenable number.

11554155151621 is a deficient number, since it is larger than the sum of its proper divisors (1).

11554155151621 is an equidigital number, since it uses as much as digits as its factorization.

11554155151621 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 150000, while the sum is 43.

It can be divided in two parts, 1155415 and 5151621, that added together give a palindrome (6307036).

The spelling of 11554155151621 in words is "eleven trillion, five hundred fifty-four billion, one hundred fifty-five million, one hundred fifty-one thousand, six hundred twenty-one".