6991316280 has 128 divisors (see below), whose sum is σ = 25097083200. Its totient is φ = 1720935936.

The previous prime is 6991316273. The next prime is 6991316281. The reversal of 6991316280 is 826131996.

It is a happy number.

6991316280 is a `hidden beast` number, since 6 + 9 + 9 + 13 + 1 + 628 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6991316281) 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, 234939 + ... + 263018.

Almost surely, 2^6991316280 is an apocalyptic number.

6991316280 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

6991316280 is an abundant number, since it is smaller than the sum of its proper divisors (18105766920).

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

6991316280 is a wasteful number, since it uses less digits than its factorization.

6991316280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 497990 (or 497980 counting only the distinct ones).

The product of its (nonzero) digits is 139968, while the sum is 45.

The square root of 6991316280 is about 83614.0913961277. The cubic root of 6991316280 is about 1912.1398383686.

The spelling of 6991316280 in words is "six billion, nine hundred ninety-one million, three hundred sixteen thousand, two hundred eighty".