6858649987 has 16 divisors (see below), whose sum is σ = 7932211200. Its totient is φ = 5808623040.

The previous prime is 6858649969. The next prime is 6858649991. The reversal of 6858649987 is 7899468586.

It is a cyclic number.

It is not a de Polignac number, because 6858649987 - 2¹⁹ = 6858125699 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6858649997) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1125214 + ... + 1131292.

It is an arithmetic number, because the mean of its divisors is an integer number (495763200).

Almost surely, 2^6858649987 is an apocalyptic number.

6858649987 is a deficient number, since it is larger than the sum of its proper divisors (1073561213).

6858649987 is a wasteful number, since it uses less digits than its factorization.

6858649987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7986.

The product of its digits is 209018880, while the sum is 70.

The square root of 6858649987 is about 82816.9667821757. The cubic root of 6858649987 is about 1899.9676806137.

The spelling of 6858649987 in words is "six billion, eight hundred fifty-eight million, six hundred forty-nine thousand, nine hundred eighty-seven".