6920861346989 has 2 divisors, whose sum is σ = 6920861346990. Its totient is φ = 6920861346988.

The previous prime is 6920861346977. The next prime is 6920861347039. The reversal of 6920861346989 is 9896431680296.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6345209860900 + 575651486089 = 2518970^2 + 758717^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6920861346989 is a prime.

It is a super-2 number, since 2×6920861346989² (a number of 26 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6920861346089) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3460430673494 + 3460430673495.

It is an arithmetic number, because the mean of its divisors is an integer number (3460430673495).

Almost surely, 2^{6920861346989} is an apocalyptic number.

It is an amenable number.

6920861346989 is a deficient number, since it is larger than the sum of its proper divisors (1).

6920861346989 is an equidigital number, since it uses as much as digits as its factorization.

6920861346989 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 241864704, while the sum is 71.

The spelling of 6920861346989 in words is "six trillion, nine hundred twenty billion, eight hundred sixty-one million, three hundred forty-six thousand, nine hundred eighty-nine".