2155726325790 has 512 divisors, whose sum is σ = 6183972864000. Its totient is φ = 533602308096.

The previous prime is 2155726325789. The next prime is 2155726325803. The reversal of 2155726325790 is 975236275512.

2155726325790 is a `hidden beast` number, since 2 + 1 + 5 + 5 + 7 + 2 + 63 + 2 + 579 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 255 ways as a sum of consecutive naturals, for example, 3301265104 + ... + 3301265756.

It is an arithmetic number, because the mean of its divisors is an integer number (12078072000).

Almost surely, 2^{2155726325790} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2155726325790, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3091986432000).

2155726325790 is an abundant number, since it is smaller than the sum of its proper divisors (4028246538210).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2155726325790 is a wasteful number, since it uses less digits than its factorization.

2155726325790 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 921 (or 915 counting only the distinct ones).

The product of its (nonzero) digits is 7938000, while the sum is 54.

The spelling of 2155726325790 in words is "two trillion, one hundred fifty-five billion, seven hundred twenty-six million, three hundred twenty-five thousand, seven hundred ninety".