6891177664990 has 8 divisors (see below), whose sum is σ = 12404119797000. Its totient is φ = 2756471065992.

The previous prime is 6891177664897. The next prime is 6891177665017. The reversal of 6891177664990 is 994667711986.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×6891177664990² (a number of 26 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 344558883240 + ... + 344558883259.

It is an arithmetic number, because the mean of its divisors is an integer number (1550514974625).

Almost surely, 2^{6891177664990} is an apocalyptic number.

6891177664990 is a deficient number, since it is larger than the sum of its proper divisors (5512942132010).

6891177664990 is a wasteful number, since it uses less digits than its factorization.

6891177664990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 689117766506.

The product of its (nonzero) digits is 246903552, while the sum is 73.

The spelling of 6891177664990 in words is "six trillion, eight hundred ninety-one billion, one hundred seventy-seven million, six hundred sixty-four thousand, nine hundred ninety".