136061375981 has 2 divisors, whose sum is σ = 136061375982. Its totient is φ = 136061375980.

The previous prime is 136061375941. The next prime is 136061375987. The reversal of 136061375981 is 189573160631.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 105046643881 + 31014732100 = 324109^2 + 176110^2 .

It is a cyclic number.

It is not a de Polignac number, because 136061375981 - 2²⁶ = 135994267117 is a prime.

It is a super-2 number, since 2×136061375981² (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 (136061375987) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 68030687990 + 68030687991.

It is an arithmetic number, because the mean of its divisors is an integer number (68030687991).

Almost surely, 2^136061375981 is an apocalyptic number.

It is an amenable number.

136061375981 is a deficient number, since it is larger than the sum of its proper divisors (1).

136061375981 is an equidigital number, since it uses as much as digits as its factorization.

136061375981 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 816480, while the sum is 50.

The spelling of 136061375981 in words is "one hundred thirty-six billion, sixty-one million, three hundred seventy-five thousand, nine hundred eighty-one".