2135651721615 has 24 divisors (see below), whose sum is σ = 3703202446320. Its totient is φ = 1138581596544.

The previous prime is 2135651721607. The next prime is 2135651721673. The reversal of 2135651721615 is 5161271565312.

2135651721615 is a `hidden beast` number, since 2 + 1 + 3 + 5 + 6 + 5 + 1 + 7 + 21 + 615 = 666.

It is not a de Polignac number, because 2135651721615 - 2³ = 2135651721607 is a prime.

It is a super-2 number, since 2×2135651721615² (a number of 25 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 8893845 + ... + 9130814.

It is an arithmetic number, because the mean of its divisors is an integer number (154300101930).

Almost surely, 2^{2135651721615} is an apocalyptic number.

2135651721615 is a deficient number, since it is larger than the sum of its proper divisors (1567550724705).

2135651721615 is a wasteful number, since it uses less digits than its factorization.

2135651721615 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18027303 (or 18027300 counting only the distinct ones).

The product of its digits is 378000, while the sum is 45.

The spelling of 2135651721615 in words is "two trillion, one hundred thirty-five billion, six hundred fifty-one million, seven hundred twenty-one thousand, six hundred fifteen".