1219745745641 has 2 divisors, whose sum is σ = 1219745745642. Its totient is φ = 1219745745640.

The previous prime is 1219745745619. The next prime is 1219745745727. The reversal of 1219745745641 is 1465475479121.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1219745745241 + 400 = 1104421^2 + 20^2 .

It is a cyclic number.

It is not a de Polignac number, because 1219745745641 - 2¹⁸ = 1219745483497 is a prime.

It is not a weakly prime, because it can be changed into another prime (1219745745601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 609872872820 + 609872872821.

It is an arithmetic number, because the mean of its divisors is an integer number (609872872821).

Almost surely, 2^{1219745745641} is an apocalyptic number.

It is an amenable number.

1219745745641 is a deficient number, since it is larger than the sum of its proper divisors (1).

1219745745641 is an equidigital number, since it uses as much as digits as its factorization.

1219745745641 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8467200, while the sum is 56.

The spelling of 1219745745641 in words is "one trillion, two hundred nineteen billion, seven hundred forty-five million, seven hundred forty-five thousand, six hundred forty-one".