10000199978 has 16 divisors (see below), whose sum is σ = 15546283560. Its totient is φ = 4818744000.

The previous prime is 10000199959. The next prime is 10000199983. The reversal of 10000199978 is 87999100001.

It can be written as a sum of positive squares in 4 ways, for example, as 8402838889 + 1597361089 = 91667^2 + 39967^2 .

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 127973 + ... + 190728.

Almost surely, 2^10000199978 is an apocalyptic number.

10000199978 is a deficient number, since it is larger than the sum of its proper divisors (5546083582).

10000199978 is a wasteful number, since it uses less digits than its factorization.

10000199978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 319273.

The product of its (nonzero) digits is 40824, while the sum is 44.

Adding to 10000199978 its reverse (87999100001), we get a palindrome (97999299979).

The spelling of 10000199978 in words is "ten billion, one hundred ninety-nine thousand, nine hundred seventy-eight".