677405621 has 2 divisors, whose sum is σ = 677405622. Its totient is φ = 677405620.

The previous prime is 677405581. The next prime is 677405623. The reversal of 677405621 is 126504776.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 376903396 + 300502225 = 19414^2 + 17335^2 .

It is a cyclic number.

It is not a de Polignac number, because 677405621 - 2¹⁰ = 677404597 is a prime.

Together with 677405623, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (677405623) 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, 338702810 + 338702811.

It is an arithmetic number, because the mean of its divisors is an integer number (338702811).

Almost surely, 2^677405621 is an apocalyptic number.

It is an amenable number.

677405621 is a deficient number, since it is larger than the sum of its proper divisors (1).

677405621 is an equidigital number, since it uses as much as digits as its factorization.

677405621 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 70560, while the sum is 38.

The square root of 677405621 is about 26027.0171360454. The cubic root of 677405621 is about 878.2461716520.

The spelling of 677405621 in words is "six hundred seventy-seven million, four hundred five thousand, six hundred twenty-one".