135404823040661 has 6 divisors (see below), whose sum is σ = 142906475287062. Its totient is φ = 128278253406600.

The previous prime is 135404823040631. The next prime is 135404823040667. The reversal of 135404823040661 is 166040328404531.

It can be written as a sum of positive squares in only one way, i.e., 133756603571761 + 1648219468900 = 11565319^2 + 1283830^2 .

It is not a de Polignac number, because 135404823040661 - 2¹⁸ = 135404822778517 is a prime.

It is a super-2 number, since 2×135404823040661² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (135404823040667) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 187541305790 + ... + 187541306511.

It is an arithmetic number, because the mean of its divisors is an integer number (23817745881177).

Almost surely, 2^{135404823040661} is an apocalyptic number.

It is an amenable number.

135404823040661 is a deficient number, since it is larger than the sum of its proper divisors (7501652246401).

135404823040661 is an equidigital number, since it uses as much as digits as its factorization.

135404823040661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 375082612339 (or 375082612320 counting only the distinct ones).

The product of its (nonzero) digits is 1658880, while the sum is 47.

The spelling of 135404823040661 in words is "one hundred thirty-five trillion, four hundred four billion, eight hundred twenty-three million, forty thousand, six hundred sixty-one".