15550342261 has 2 divisors, whose sum is σ = 15550342262. Its totient is φ = 15550342260.

The previous prime is 15550342219. The next prime is 15550342267. The reversal of 15550342261 is 16224305551.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15473867236 + 76475025 = 124394^2 + 8745^2 .

It is an emirp because it is prime and its reverse (16224305551) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 15550342261 - 2¹³ = 15550334069 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (15550342267) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7775171130 + 7775171131.

It is an arithmetic number, because the mean of its divisors is an integer number (7775171131).

Almost surely, 2^15550342261 is an apocalyptic number.

It is an amenable number.

15550342261 is a deficient number, since it is larger than the sum of its proper divisors (1).

15550342261 is an equidigital number, since it uses as much as digits as its factorization.

15550342261 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 36000, while the sum is 34.

The spelling of 15550342261 in words is "fifteen billion, five hundred fifty million, three hundred forty-two thousand, two hundred sixty-one".