2742365437781 has 2 divisors, whose sum is σ = 2742365437782. Its totient is φ = 2742365437780.

The previous prime is 2742365437699. The next prime is 2742365437807. The reversal of 2742365437781 is 1877345632472.

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., 2006259780625 + 736105657156 = 1416425^2 + 857966^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2742365437781 is a prime.

It is a super-2 number, since 2×2742365437781² (a number of 26 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 2742365437781.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2742365437681) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1371182718890 + 1371182718891.

It is an arithmetic number, because the mean of its divisors is an integer number (1371182718891).

Almost surely, 2^{2742365437781} is an apocalyptic number.

It is an amenable number.

2742365437781 is a deficient number, since it is larger than the sum of its proper divisors (1).

2742365437781 is an equidigital number, since it uses as much as digits as its factorization.

2742365437781 is an evil number, because the sum of its binary digits is even.

The product of its digits is 47416320, while the sum is 59.

The spelling of 2742365437781 in words is "two trillion, seven hundred forty-two billion, three hundred sixty-five million, four hundred thirty-seven thousand, seven hundred eighty-one".