2135741661 has 10 divisors (see below), whose sum is σ = 3190429022. Its totient is φ = 1423827720.

The previous prime is 2135741623. The next prime is 2135741693. The reversal of 2135741661 is 1661475312.

2135741661 is a `hidden beast` number, since 2 + 13 + 574 + 16 + 61 = 666.

It can be written as a sum of positive squares in only one way, i.e., 2099380761 + 36360900 = 45819^2 + 6030^2 .

It is not a de Polignac number, because 2135741661 - 2¹⁰ = 2135740637 is a prime.

It is a super-2 number, since 2×2135741661² = 9122784885062077842, which 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 (2135741561) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 13183510 + ... + 13183671.

Almost surely, 2^2135741661 is an apocalyptic number.

It is an amenable number.

2135741661 is a deficient number, since it is larger than the sum of its proper divisors (1054687361).

2135741661 is an equidigital number, since it uses as much as digits as its factorization.

2135741661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26367193 (or 26367184 counting only the distinct ones).

The product of its digits is 30240, while the sum is 36.

The square root of 2135741661 is about 46214.0850931834. The cubic root of 2135741661 is about 1287.8034170500.

The spelling of 2135741661 in words is "two billion, one hundred thirty-five million, seven hundred forty-one thousand, six hundred sixty-one".