677566639 has 2 divisors, whose sum is σ = 677566640. Its totient is φ = 677566638.

The previous prime is 677566633. The next prime is 677566661. The reversal of 677566639 is 936665776.

677566639 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 677566639 - 2¹³ = 677558447 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 677566639.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (677566633) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 338783319 + 338783320.

It is an arithmetic number, because the mean of its divisors is an integer number (338783320).

Almost surely, 2^677566639 is an apocalyptic number.

677566639 is a deficient number, since it is larger than the sum of its proper divisors (1).

677566639 is an equidigital number, since it uses as much as digits as its factorization.

677566639 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8573040, while the sum is 55.

The square root of 677566639 is about 26030.1102379533. The cubic root of 677566639 is about 878.3157519422.

The spelling of 677566639 in words is "six hundred seventy-seven million, five hundred sixty-six thousand, six hundred thirty-nine".