691167663648 has 576 divisors, whose sum is σ = 2552370912000. Its totient is φ = 172146401280.

The previous prime is 691167663623. The next prime is 691167663653. The reversal of 691167663648 is 846366761196.

It is a Smith number, since the sum of its digits (63) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a nude number because it is divisible by every one of its digits.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 95818890 + ... + 95826102.

It is an arithmetic number, because the mean of its divisors is an integer number (4431199500).

Almost surely, 2^691167663648 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 691167663648, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1276185456000).

691167663648 is an abundant number, since it is smaller than the sum of its proper divisors (1861203248352).

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

691167663648 is a wasteful number, since it uses less digits than its factorization.

691167663648 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7425 (or 7414 counting only the distinct ones).

The product of its digits is 47029248, while the sum is 63.

The spelling of 691167663648 in words is "six hundred ninety-one billion, one hundred sixty-seven million, six hundred sixty-three thousand, six hundred forty-eight".