135411452251661 has 2 divisors, whose sum is σ = 135411452251662. Its totient is φ = 135411452251660.

The previous prime is 135411452251633. The next prime is 135411452251739. The reversal of 135411452251661 is 166152254114531.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 117832978908100 + 17578473343561 = 10855090^2 + 4192669^2 .

It is a cyclic number.

It is not a de Polignac number, because 135411452251661 - 2²² = 135411448057357 is a prime.

It is a super-2 number, since 2×135411452251661² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (135411452251561) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 67705726125830 + 67705726125831.

It is an arithmetic number, because the mean of its divisors is an integer number (67705726125831).

Almost surely, 2^{135411452251661} is an apocalyptic number.

It is an amenable number.

135411452251661 is a deficient number, since it is larger than the sum of its proper divisors (1).

135411452251661 is an equidigital number, since it uses as much as digits as its factorization.

135411452251661 is an evil number, because the sum of its binary digits is even.

The product of its digits is 864000, while the sum is 47.

The spelling of 135411452251661 in words is "one hundred thirty-five trillion, four hundred eleven billion, four hundred fifty-two million, two hundred fifty-one thousand, six hundred sixty-one".