6985378011487 has 4 divisors (see below), whose sum is σ = 7396282600416. Its totient is φ = 6574473422560.

The previous prime is 6985378011461. The next prime is 6985378011509. The reversal of 6985378011487 is 7841108735896.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 6985378011487 - 2¹⁹ = 6985377487199 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6985378011407) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 205452294439 + ... + 205452294472.

It is an arithmetic number, because the mean of its divisors is an integer number (1849070650104).

Almost surely, 2^{6985378011487} is an apocalyptic number.

6985378011487 is a deficient number, since it is larger than the sum of its proper divisors (410904588929).

6985378011487 is a wasteful number, since it uses less digits than its factorization.

6985378011487 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 410904588928.

The product of its (nonzero) digits is 81285120, while the sum is 67.

The spelling of 6985378011487 in words is "six trillion, nine hundred eighty-five billion, three hundred seventy-eight million, eleven thousand, four hundred eighty-seven".