19415415640561 has 2 divisors, whose sum is σ = 19415415640562. Its totient is φ = 19415415640560.

The previous prime is 19415415640519. The next prime is 19415415640591. The reversal of 19415415640561 is 16504651451491.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19039608633600 + 375807006961 = 4363440^2 + 613031^2 .

It is a cyclic number.

It is not a de Polignac number, because 19415415640561 - 2¹⁵ = 19415415607793 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 19415415640499 and 19415415640508.

It is not a weakly prime, because it can be changed into another prime (19415415640591) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9707707820280 + 9707707820281.

It is an arithmetic number, because the mean of its divisors is an integer number (9707707820281).

Almost surely, 2^{19415415640561} is an apocalyptic number.

It is an amenable number.

19415415640561 is a deficient number, since it is larger than the sum of its proper divisors (1).

19415415640561 is an equidigital number, since it uses as much as digits as its factorization.

19415415640561 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2592000, while the sum is 52.

The spelling of 19415415640561 in words is "nineteen trillion, four hundred fifteen billion, four hundred fifteen million, six hundred forty thousand, five hundred sixty-one".