855677639 has 2 divisors, whose sum is σ = 855677640. Its totient is φ = 855677638.

The previous prime is 855677621. The next prime is 855677657. The reversal of 855677639 is 936776558.

It is a balanced prime because it is at equal distance from previous prime (855677621) and next prime (855677657).

It is a cyclic number.

It is not a de Polignac number, because 855677639 - 2¹⁶ = 855612103 is a prime.

It is a super-2 number, since 2×855677639² = 1464368443769228642, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (855677689) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 427838819 + 427838820.

It is an arithmetic number, because the mean of its divisors is an integer number (427838820).

Almost surely, 2^855677639 is an apocalyptic number.

855677639 is a deficient number, since it is larger than the sum of its proper divisors (1).

855677639 is an equidigital number, since it uses as much as digits as its factorization.

855677639 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9525600, while the sum is 56.

The square root of 855677639 is about 29251.9681218205. The cubic root of 855677639 is about 949.3726750388.

The spelling of 855677639 in words is "eight hundred fifty-five million, six hundred seventy-seven thousand, six hundred thirty-nine".