2556221652135 has 64 divisors (see below), whose sum is σ = 4549791254400. Its totient is φ = 1361700274176.

The previous prime is 2556221652109. The next prime is 2556221652139. The reversal of 2556221652135 is 5312561226552.

2556221652135 is a `hidden beast` number, since 2 + 5 + 5 + 622 + 1 + 6 + 5 + 2 + 13 + 5 = 666.

It is not a de Polignac number, because 2556221652135 - 2⁶ = 2556221652071 is a prime.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2556221652139) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 606168547 + ... + 606172763.

It is an arithmetic number, because the mean of its divisors is an integer number (71090488350).

Almost surely, 2^{2556221652135} is an apocalyptic number.

2556221652135 is a deficient number, since it is larger than the sum of its proper divisors (1993569602265).

2556221652135 is a wasteful number, since it uses less digits than its factorization.

2556221652135 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8497 (or 8491 counting only the distinct ones).

The product of its digits is 1080000, while the sum is 45.

Adding to 2556221652135 its reverse (5312561226552), we get a palindrome (7868782878687).

The spelling of 2556221652135 in words is "two trillion, five hundred fifty-six billion, two hundred twenty-one million, six hundred fifty-two thousand, one hundred thirty-five".