9561939877493 has 2 divisors, whose sum is σ = 9561939877494. Its totient is φ = 9561939877492.

The previous prime is 9561939877417. The next prime is 9561939877517. The reversal of 9561939877493 is 3947789391659.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9513881153764 + 48058723729 = 3084458^2 + 219223^2 .

It is an emirp because it is prime and its reverse (3947789391659) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 9561939877493 - 2²² = 9561935683189 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9561939876493) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4780969938746 + 4780969938747.

It is an arithmetic number, because the mean of its divisors is an integer number (4780969938747).

Almost surely, 2^{9561939877493} is an apocalyptic number.

It is an amenable number.

9561939877493 is a deficient number, since it is larger than the sum of its proper divisors (1).

9561939877493 is an equidigital number, since it uses as much as digits as its factorization.

9561939877493 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2777664960, while the sum is 80.

The spelling of 9561939877493 in words is "nine trillion, five hundred sixty-one billion, nine hundred thirty-nine million, eight hundred seventy-seven thousand, four hundred ninety-three".