2086651639 has 4 divisors (see below), whose sum is σ = 2088023256. Its totient is φ = 2085280024.

The previous prime is 2086651613. The next prime is 2086651657. The reversal of 2086651639 is 9361566802.

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 2086651639 - 2²¹ = 2084554487 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 (2086631639) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 683524 + ... + 686569.

It is an arithmetic number, because the mean of its divisors is an integer number (522005814).

Almost surely, 2^2086651639 is an apocalyptic number.

2086651639 is a deficient number, since it is larger than the sum of its proper divisors (1371617).

2086651639 is a wasteful number, since it uses less digits than its factorization.

2086651639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1371616.

The product of its (nonzero) digits is 466560, while the sum is 46.

The square root of 2086651639 is about 45679.8822130706. The cubic root of 2086651639 is about 1277.8601206701.

The spelling of 2086651639 in words is "two billion, eighty-six million, six hundred fifty-one thousand, six hundred thirty-nine".