135477822581 has 2 divisors, whose sum is σ = 135477822582. Its totient is φ = 135477822580.

The previous prime is 135477822569. The next prime is 135477822587. The reversal of 135477822581 is 185228774531.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 98868740356 + 36609082225 = 314434^2 + 191335^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-135477822581 is a prime.

It is a super-2 number, since 2×135477822581² (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 (135477822587) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 67738911290 + 67738911291.

It is an arithmetic number, because the mean of its divisors is an integer number (67738911291).

Almost surely, 2^135477822581 is an apocalyptic number.

It is an amenable number.

135477822581 is a deficient number, since it is larger than the sum of its proper divisors (1).

135477822581 is an equidigital number, since it uses as much as digits as its factorization.

135477822581 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3763200, while the sum is 53.

The spelling of 135477822581 in words is "one hundred thirty-five billion, four hundred seventy-seven million, eight hundred twenty-two thousand, five hundred eighty-one".