6991477416 has 224 divisors, whose sum is σ = 24505934400. Its totient is φ = 1815851520.

The previous prime is 6991477397. The next prime is 6991477469. The reversal of 6991477416 is 6147741996.

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

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 55 ways as a sum of consecutive naturals, for example, 441280 + ... + 456848.

Almost surely, 2^6991477416 is an apocalyptic number.

6991477416 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6991477416, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (12252967200).

6991477416 is an abundant number, since it is smaller than the sum of its proper divisors (17514456984).

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

6991477416 is a wasteful number, since it uses less digits than its factorization.

6991477416 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15611 (or 15592 counting only the distinct ones).

The product of its digits is 2286144, while the sum is 54.

The square root of 6991477416 is about 83615.0549602163. The cubic root of 6991477416 is about 1912.1545286017.

The spelling of 6991477416 in words is "six billion, nine hundred ninety-one million, four hundred seventy-seven thousand, four hundred sixteen".