135661011344 has 10 divisors (see below), whose sum is σ = 262843209510. Its totient is φ = 67830505664.

The previous prime is 135661011331. The next prime is 135661011371. The reversal of 135661011344 is 443110166531.

It can be written as a sum of positive squares in only one way, i.e., 73610201344 + 62050810000 = 271312^2 + 249100^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4239406589 + ... + 4239406620.

It is an arithmetic number, because the mean of its divisors is an integer number (26284320951).

Almost surely, 2^135661011344 is an apocalyptic number.

It is an amenable number.

135661011344 is a deficient number, since it is larger than the sum of its proper divisors (127182198166).

135661011344 is an equidigital number, since it uses as much as digits as its factorization.

135661011344 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8478813217 (or 8478813211 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 35.

Adding to 135661011344 its reverse (443110166531), we get a palindrome (578771177875).

The spelling of 135661011344 in words is "one hundred thirty-five billion, six hundred sixty-one million, eleven thousand, three hundred forty-four".