2113646505551 has 4 divisors (see below), whose sum is σ = 2415596006352. Its totient is φ = 1811697004752.

The previous prime is 2113646505491. The next prime is 2113646505577. The reversal of 2113646505551 is 1555056463112.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 2113646505551 - 2¹⁴ = 2113646489167 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2113646504551) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 150974750390 + ... + 150974750403.

It is an arithmetic number, because the mean of its divisors is an integer number (603899001588).

Almost surely, 2^{2113646505551} is an apocalyptic number.

2113646505551 is a deficient number, since it is larger than the sum of its proper divisors (301949500801).

2113646505551 is an equidigital number, since it uses as much as digits as its factorization.

2113646505551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 301949500800.

The product of its (nonzero) digits is 540000, while the sum is 44.

The spelling of 2113646505551 in words is "two trillion, one hundred thirteen billion, six hundred forty-six million, five hundred five thousand, five hundred fifty-one".