6921911717064 has 128 divisors (see below), whose sum is σ = 19980984960000. Its totient is φ = 2217888691200.

The previous prime is 6921911717059. The next prime is 6921911717081. The reversal of 6921911717064 is 4607171191296.

It is a happy number.

It is a super-3 number, since 3×6921911717064³ (a number of 39 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a self number, because there is not a number n which added to its sum of digits gives 6921911717064.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2471217 + ... + 4466624.

It is an arithmetic number, because the mean of its divisors is an integer number (156101445000).

Almost surely, 2^{6921911717064} is an apocalyptic number.

It is an amenable number.

6921911717064 is an abundant number, since it is smaller than the sum of its proper divisors (13059073242936).

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

6921911717064 is a wasteful number, since it uses less digits than its factorization.

6921911717064 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6938036 (or 6938026 counting only the distinct ones).

The product of its (nonzero) digits is 1143072, while the sum is 54.

The spelling of 6921911717064 in words is "six trillion, nine hundred twenty-one billion, nine hundred eleven million, seven hundred seventeen thousand, sixty-four".