2061854639 has 16 divisors (see below), whose sum is σ = 2364253920. Its totient is φ = 1781253120.

The previous prime is 2061854623. The next prime is 2061854647. The reversal of 2061854639 is 9364581602.

It is a cyclic number.

It is not a de Polignac number, because 2061854639 - 2⁴ = 2061854623 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2061854639.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2061854239) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13499 + ... + 65619.

It is an arithmetic number, because the mean of its divisors is an integer number (147765870).

Almost surely, 2^2061854639 is an apocalyptic number.

2061854639 is a deficient number, since it is larger than the sum of its proper divisors (302399281).

2061854639 is a wasteful number, since it uses less digits than its factorization.

2061854639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52330.

The product of its (nonzero) digits is 311040, while the sum is 44.

The square root of 2061854639 is about 45407.6495648035. The cubic root of 2061854639 is about 1272.7780629869.

It can be divided in two parts, 20618 and 54639, that added together give a palindrome (75257).

The spelling of 2061854639 in words is "two billion, sixty-one million, eight hundred fifty-four thousand, six hundred thirty-nine".