45005561261 has 2 divisors, whose sum is σ = 45005561262. Its totient is φ = 45005561260.

The previous prime is 45005561233. The next prime is 45005561353. The reversal of 45005561261 is 16216550054.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 38266793161 + 6738768100 = 195619^2 + 82090^2 .

It is a cyclic number.

It is not a de Polignac number, because 45005561261 - 2⁶ = 45005561197 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (45005561221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 22502780630 + 22502780631.

It is an arithmetic number, because the mean of its divisors is an integer number (22502780631).

Almost surely, 2^45005561261 is an apocalyptic number.

It is an amenable number.

45005561261 is a deficient number, since it is larger than the sum of its proper divisors (1).

45005561261 is an equidigital number, since it uses as much as digits as its factorization.

45005561261 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 35.

The spelling of 45005561261 in words is "forty-five billion, five million, five hundred sixty-one thousand, two hundred sixty-one".