11621554261505 has 4 divisors (see below), whose sum is σ = 13945865113812. Its totient is φ = 9297243409200.

The previous prime is 11621554261411. The next prime is 11621554261511. The reversal of 11621554261505 is 50516245512611.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 8615939125264 + 3005615136241 = 2935292^2 + 1733671^2 .

It is not a de Polignac number, because 11621554261505 - 2¹⁴ = 11621554245121 is a prime.

It is a Duffinian number.

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, 1162155426146 + ... + 1162155426155.

It is an arithmetic number, because the mean of its divisors is an integer number (3486466278453).

Almost surely, 2^{11621554261505} is an apocalyptic number.

It is an amenable number.

11621554261505 is a deficient number, since it is larger than the sum of its proper divisors (2324310852307).

11621554261505 is an equidigital number, since it uses as much as digits as its factorization.

11621554261505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2324310852306.

The product of its (nonzero) digits is 360000, while the sum is 44.

The spelling of 11621554261505 in words is "eleven trillion, six hundred twenty-one billion, five hundred fifty-four million, two hundred sixty-one thousand, five hundred five".