6840121978590 has 32 divisors (see below), whose sum is σ = 16685412306336. Its totient is φ = 1794130354560.

The previous prime is 6840121978589. The next prime is 6840121978603. The reversal of 6840121978590 is 958791210486.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1868883957 + ... + 1868887616.

It is an arithmetic number, because the mean of its divisors is an integer number (521419134573).

Almost surely, 2^{6840121978590} is an apocalyptic number.

6840121978590 is an abundant number, since it is smaller than the sum of its proper divisors (9845290327746).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

6840121978590 is a wasteful number, since it uses less digits than its factorization.

6840121978590 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3737771644.

The product of its (nonzero) digits is 8709120, while the sum is 60.

The spelling of 6840121978590 in words is "six trillion, eight hundred forty billion, one hundred twenty-one million, nine hundred seventy-eight thousand, five hundred ninety".