10991683620 has 72 divisors (see below), whose sum is σ = 33350236920. Its totient is φ = 2930342400.

The previous prime is 10991683613. The next prime is 10991683649. The reversal of 10991683620 is 2638619901.

It is a happy number.

10991683620 is a `hidden beast` number, since 1 + 0 + 9 + 9 + 16 + 8 + 3 + 620 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 5121978624 + 5869704996 = 71568^2 + 76614^2 .

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

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, 1093176 + ... + 1103184.

It is an arithmetic number, because the mean of its divisors is an integer number (463197735).

Almost surely, 2^10991683620 is an apocalyptic number.

10991683620 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

10991683620 is an abundant number, since it is smaller than the sum of its proper divisors (22358553300).

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

10991683620 is a wasteful number, since it uses less digits than its factorization.

10991683620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16125 (or 16120 counting only the distinct ones).

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

The spelling of 10991683620 in words is "ten billion, nine hundred ninety-one million, six hundred eighty-three thousand, six hundred twenty".