15542012332261 has 2 divisors, whose sum is σ = 15542012332262. Its totient is φ = 15542012332260.

The previous prime is 15542012332219. The next prime is 15542012332289. The reversal of 15542012332261 is 16223321024551.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12317509756161 + 3224502576100 = 3509631^2 + 1795690^2 .

It is a cyclic number.

It is not a de Polignac number, because 15542012332261 - 2²¹ = 15542010235109 is a prime.

It is a super-2 number, since 2×15542012332261² (a number of 27 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 15542012332261.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (15542012335261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7771006166130 + 7771006166131.

It is an arithmetic number, because the mean of its divisors is an integer number (7771006166131).

Almost surely, 2^{15542012332261} is an apocalyptic number.

It is an amenable number.

15542012332261 is a deficient number, since it is larger than the sum of its proper divisors (1).

15542012332261 is an equidigital number, since it uses as much as digits as its factorization.

15542012332261 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 86400, while the sum is 37.

The spelling of 15542012332261 in words is "fifteen trillion, five hundred forty-two billion, twelve million, three hundred thirty-two thousand, two hundred sixty-one".