2135666461 has 4 divisors (see below), whose sum is σ = 2138604832. Its totient is φ = 2132728092.

The previous prime is 2135666453. The next prime is 2135666471. The reversal of 2135666461 is 1646665312.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2135666461 - 2³ = 2135666453 is a prime.

It is a super-2 number, since 2×2135666461² = 9122142465280529042, 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 (2135666441) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1468095 + ... + 1469548.

It is an arithmetic number, because the mean of its divisors is an integer number (534651208).

Almost surely, 2^2135666461 is an apocalyptic number.

It is an amenable number.

2135666461 is a deficient number, since it is larger than the sum of its proper divisors (2938371).

2135666461 is an equidigital number, since it uses as much as digits as its factorization.

2135666461 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2938370.

The product of its digits is 155520, while the sum is 40.

The square root of 2135666461 is about 46213.2714812531. The cubic root of 2135666461 is about 1287.7883022454.

The spelling of 2135666461 in words is "two billion, one hundred thirty-five million, six hundred sixty-six thousand, four hundred sixty-one".