9861372993811 has 32 divisors (see below), whose sum is σ = 10471589227008. Its totient is φ = 9267675056640.

The previous prime is 9861372993793. The next prime is 9861372993817. The reversal of 9861372993811 is 1183992731689.

It is a cyclic number.

It is not a de Polignac number, because 9861372993811 - 2⁵ = 9861372993779 is a prime.

It is a Smith number, since the sum of its digits (67) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9861372993817) 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, 255383896 + ... + 255422506.

It is an arithmetic number, because the mean of its divisors is an integer number (327237163344).

Almost surely, 2^{9861372993811} is an apocalyptic number.

9861372993811 is a deficient number, since it is larger than the sum of its proper divisors (610216233197).

9861372993811 is a wasteful number, since it uses less digits than its factorization.

9861372993811 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39451.

The product of its digits is 35271936, while the sum is 67.

The spelling of 9861372993811 in words is "nine trillion, eight hundred sixty-one billion, three hundred seventy-two million, nine hundred ninety-three thousand, eight hundred eleven".