1691138552864 has 192 divisors, whose sum is σ = 3781871493120. Its totient is φ = 740171520000.

The previous prime is 1691138552861. The next prime is 1691138552867. The reversal of 1691138552864 is 4682558311961.

It is an interprime number because it is at equal distance from previous prime (1691138552861) and next prime (1691138552867).

It is not an unprimeable number, because it can be changed into a prime (1691138552861) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 260532659 + ... + 260539149.

It is an arithmetic number, because the mean of its divisors is an integer number (19697247360).

Almost surely, 2^{1691138552864} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1691138552864, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1890935746560).

1691138552864 is an abundant number, since it is smaller than the sum of its proper divisors (2090732940256).

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

1691138552864 is a wasteful number, since it uses less digits than its factorization.

1691138552864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7175 (or 7167 counting only the distinct ones).

The product of its digits is 12441600, while the sum is 59.

The spelling of 1691138552864 in words is "one trillion, six hundred ninety-one billion, one hundred thirty-eight million, five hundred fifty-two thousand, eight hundred sixty-four".