1216198904810 has 16 divisors (see below), whose sum is σ = 2219146496136. Its totient is φ = 479815458048.

The previous prime is 1216198904797. The next prime is 1216198904857. The reversal of 1216198904810 is 184098916121.

It can be written as a sum of positive squares in 4 ways, for example, as 698810730601 + 517388174209 = 835949^2 + 719297^2 .

It is a super-2 number, since 2×1216198904810² (a number of 25 digits) contains 22 as substring.

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, 833012219 + ... + 833013678.

Almost surely, 2^{1216198904810} is an apocalyptic number.

1216198904810 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1216198904810 is a deficient number, since it is larger than the sum of its proper divisors (1002947591326).

1216198904810 is a wasteful number, since it uses less digits than its factorization.

1216198904810 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1666025977.

The product of its (nonzero) digits is 248832, while the sum is 50.

The spelling of 1216198904810 in words is "one trillion, two hundred sixteen billion, one hundred ninety-eight million, nine hundred four thousand, eight hundred ten".