6857999977 has 2 divisors, whose sum is σ = 6857999978. Its totient is φ = 6857999976.

The previous prime is 6857999947. The next prime is 6858000029. The reversal of 6857999977 is 7799997586.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3445220416 + 3412779561 = 58696^2 + 58419^2 .

It is a cyclic number.

It is not a de Polignac number, because 6857999977 - 2³¹ = 4710516329 is a prime.

It is not a weakly prime, because it can be changed into another prime (6857999947) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3428999988 + 3428999989.

It is an arithmetic number, because the mean of its divisors is an integer number (3428999989).

Almost surely, 2^6857999977 is an apocalyptic number.

It is an amenable number.

6857999977 is a deficient number, since it is larger than the sum of its proper divisors (1).

6857999977 is an equidigital number, since it uses as much as digits as its factorization.

6857999977 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 540101520, while the sum is 76.

The square root of 6857999977 is about 82813.0423121866. The cubic root of 6857999977 is about 1899.9076572849.

The spelling of 6857999977 in words is "six billion, eight hundred fifty-seven million, nine hundred ninety-nine thousand, nine hundred seventy-seven".