1561144674899 has 2 divisors, whose sum is σ = 1561144674900. Its totient is φ = 1561144674898.

The previous prime is 1561144674889. The next prime is 1561144674911. The reversal of 1561144674899 is 9984764411651.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1561144674899 - 2²⁴ = 1561127897683 is a prime.

It is a super-3 number, since 3×1561144674899³ (a number of 38 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (1561144674889) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 780572337449 + 780572337450.

It is an arithmetic number, because the mean of its divisors is an integer number (780572337450).

Almost surely, 2^{1561144674899} is an apocalyptic number.

1561144674899 is a deficient number, since it is larger than the sum of its proper divisors (1).

1561144674899 is an equidigital number, since it uses as much as digits as its factorization.

1561144674899 is an evil number, because the sum of its binary digits is even.

The product of its digits is 52254720, while the sum is 65.

The spelling of 1561144674899 in words is "one trillion, five hundred sixty-one billion, one hundred forty-four million, six hundred seventy-four thousand, eight hundred ninety-nine".