137888367781 has 2 divisors, whose sum is σ = 137888367782. Its totient is φ = 137888367780.

The previous prime is 137888367739. The next prime is 137888367811. The reversal of 137888367781 is 187763888731.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 129750523681 + 8137844100 = 360209^2 + 90210^2 .

It is a cyclic number.

It is not a de Polignac number, because 137888367781 - 2¹³ = 137888359589 is a prime.

It is a super-2 number, since 2×137888367781² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (137888365781) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 68944183890 + 68944183891.

It is an arithmetic number, because the mean of its divisors is an integer number (68944183891).

Almost surely, 2^137888367781 is an apocalyptic number.

It is an amenable number.

137888367781 is a deficient number, since it is larger than the sum of its proper divisors (1).

137888367781 is an equidigital number, since it uses as much as digits as its factorization.

137888367781 is an evil number, because the sum of its binary digits is even.

The product of its digits is 75866112, while the sum is 67.

The spelling of 137888367781 in words is "one hundred thirty-seven billion, eight hundred eighty-eight million, three hundred sixty-seven thousand, seven hundred eighty-one".