15555474755461 has 2 divisors, whose sum is σ = 15555474755462. Its totient is φ = 15555474755460.

The previous prime is 15555474755393. The next prime is 15555474755519. The reversal of 15555474755461 is 16455747455551.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15320413656900 + 235061098561 = 3914130^2 + 484831^2 .

It is an emirp because it is prime and its reverse (16455747455551) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 15555474755461 - 2¹³ = 15555474747269 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 15555474755393 and 15555474755402.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (15555474755861) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7777737377730 + 7777737377731.

It is an arithmetic number, because the mean of its divisors is an integer number (7777737377731).

Almost surely, 2^{15555474755461} is an apocalyptic number.

It is an amenable number.

15555474755461 is a deficient number, since it is larger than the sum of its proper divisors (1).

15555474755461 is an equidigital number, since it uses as much as digits as its factorization.

15555474755461 is an evil number, because the sum of its binary digits is even.

The product of its digits is 294000000, while the sum is 64.

The spelling of 15555474755461 in words is "fifteen trillion, five hundred fifty-five billion, four hundred seventy-four million, seven hundred fifty-five thousand, four hundred sixty-one".