135625661 has 2 divisors, whose sum is σ = 135625662. Its totient is φ = 135625660.

The previous prime is 135625649. The next prime is 135625697. The reversal of 135625661 is 166526531.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 130759225 + 4866436 = 11435^2 + 2206^2 .

It is a cyclic number.

It is not a de Polignac number, because 135625661 - 2¹⁴ = 135609277 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (135625561) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 67812830 + 67812831.

It is an arithmetic number, because the mean of its divisors is an integer number (67812831).

Almost surely, 2^135625661 is an apocalyptic number.

It is an amenable number.

135625661 is a deficient number, since it is larger than the sum of its proper divisors (1).

135625661 is an equidigital number, since it uses as much as digits as its factorization.

135625661 is an evil number, because the sum of its binary digits is even.

The product of its digits is 32400, while the sum is 35.

The square root of 135625661 is about 11645.8430781116. The cubic root of 135625661 is about 513.7840556551.

The spelling of 135625661 in words is "one hundred thirty-five million, six hundred twenty-five thousand, six hundred sixty-one".