991989141696 has 168 divisors, whose sum is σ = 3294067116704. Its totient is φ = 279542845440.

The previous prime is 991989141659. The next prime is 991989141719. The reversal of 991989141696 is 696141989199.

It is a tau number, because it is divible by the number of its divisors (168).

It is a Harshad number since it is a multiple of its sum of digits (72).

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

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1390795 + ... + 1979466.

Almost surely, 2^991989141696 is an apocalyptic number.

991989141696 is a gapful number since it is divisible by the number (96) formed by its first and last digit.

It is an amenable number.

991989141696 is an abundant number, since it is smaller than the sum of its proper divisors (2302077975008).

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

991989141696 is a wasteful number, since it uses less digits than its factorization.

991989141696 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3370359 (or 3370346 counting only the distinct ones).

The product of its digits is 68024448, while the sum is 72.

The spelling of 991989141696 in words is "nine hundred ninety-one billion, nine hundred eighty-nine million, one hundred forty-one thousand, six hundred ninety-six".