135861664997 has 2 divisors, whose sum is σ = 135861664998. Its totient is φ = 135861664996.

The previous prime is 135861664963. The next prime is 135861665003. The reversal of 135861664997 is 799466168531.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 119108504641 + 16753160356 = 345121^2 + 129434^2 .

It is a cyclic number.

It is not a de Polignac number, because 135861664997 - 2³⁰ = 134787923173 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (135861664957) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 67930832498 + 67930832499.

It is an arithmetic number, because the mean of its divisors is an integer number (67930832499).

Almost surely, 2^135861664997 is an apocalyptic number.

It is an amenable number.

135861664997 is a deficient number, since it is larger than the sum of its proper divisors (1).

135861664997 is an equidigital number, since it uses as much as digits as its factorization.

135861664997 is an evil number, because the sum of its binary digits is even.

The product of its digits is 58786560, while the sum is 65.

The spelling of 135861664997 in words is "one hundred thirty-five billion, eight hundred sixty-one million, six hundred sixty-four thousand, nine hundred ninety-seven".