10000999980 has 72 divisors (see below), whose sum is σ = 31933028400. Its totient is φ = 2526567552.

The previous prime is 10000999979. The next prime is 10000999991. The reversal of 10000999980 is 8999900001.

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, 1458715 + ... + 1465554.

Almost surely, 2^10000999980 is an apocalyptic number.

10000999980 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

10000999980 is an abundant number, since it is smaller than the sum of its proper divisors (21932028420).

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

10000999980 is a wasteful number, since it uses less digits than its factorization.

10000999980 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2924303 (or 2924298 counting only the distinct ones).

The product of its (nonzero) digits is 52488, while the sum is 45.

Adding to 10000999980 its sum of digits (45), we get a square (10001000025 = 100005²).

The spelling of 10000999980 in words is "ten billion, nine hundred ninety-nine thousand, nine hundred eighty".