45205561081 has 2 divisors, whose sum is σ = 45205561082. Its totient is φ = 45205561080.

The previous prime is 45205561057. The next prime is 45205561139. The reversal of 45205561081 is 18016550254.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 44918563600 + 286997481 = 211940^2 + 16941^2 .

It is a cyclic number.

It is not a de Polignac number, because 45205561081 - 2¹¹ = 45205559033 is a prime.

It is a super-2 number, since 2×45205561081² (a number of 22 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 45205561081.

It is not a weakly prime, because it can be changed into another prime (45205561381) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 22602780540 + 22602780541.

It is an arithmetic number, because the mean of its divisors is an integer number (22602780541).

Almost surely, 2^45205561081 is an apocalyptic number.

It is an amenable number.

45205561081 is a deficient number, since it is larger than the sum of its proper divisors (1).

45205561081 is an equidigital number, since it uses as much as digits as its factorization.

45205561081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 48000, while the sum is 37.

The spelling of 45205561081 in words is "forty-five billion, two hundred five million, five hundred sixty-one thousand, eighty-one".