137774111861 has 2 divisors, whose sum is σ = 137774111862. Its totient is φ = 137774111860.

The previous prime is 137774111851. The next prime is 137774111863. The reversal of 137774111861 is 168111477731.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 130876809361 + 6897302500 = 361769^2 + 83050^2 .

It is a cyclic number.

It is not a de Polignac number, because 137774111861 - 2²² = 137769917557 is a prime.

Together with 137774111863, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (137774111863) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 68887055930 + 68887055931.

It is an arithmetic number, because the mean of its divisors is an integer number (68887055931).

Almost surely, 2^137774111861 is an apocalyptic number.

It is an amenable number.

137774111861 is a deficient number, since it is larger than the sum of its proper divisors (1).

137774111861 is an equidigital number, since it uses as much as digits as its factorization.

137774111861 is an evil number, because the sum of its binary digits is even.

The product of its digits is 197568, while the sum is 47.

The spelling of 137774111861 in words is "one hundred thirty-seven billion, seven hundred seventy-four million, one hundred eleven thousand, eight hundred sixty-one".