1545621160561 has 2 divisors, whose sum is σ = 1545621160562. Its totient is φ = 1545621160560.

The previous prime is 1545621160537. The next prime is 1545621160607. The reversal of 1545621160561 is 1650611265451.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1282420353600 + 263200806961 = 1132440^2 + 513031^2 .

It is a cyclic number.

It is not a de Polignac number, because 1545621160561 - 2¹⁷ = 1545621029489 is a prime.

It is not a weakly prime, because it can be changed into another prime (1545621160511) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 772810580280 + 772810580281.

It is an arithmetic number, because the mean of its divisors is an integer number (772810580281).

Almost surely, 2^{1545621160561} is an apocalyptic number.

It is an amenable number.

1545621160561 is a deficient number, since it is larger than the sum of its proper divisors (1).

1545621160561 is an equidigital number, since it uses as much as digits as its factorization.

1545621160561 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 216000, while the sum is 43.

The spelling of 1545621160561 in words is "one trillion, five hundred forty-five billion, six hundred twenty-one million, one hundred sixty thousand, five hundred sixty-one".