9977218839 has 144 divisors (see below), whose sum is σ = 18506741760. Its totient is φ = 5143824000.

The previous prime is 9977218837. The next prime is 9977218843. The reversal of 9977218839 is 9388127799.

It is not a de Polignac number, because 9977218839 - 2¹ = 9977218837 is a prime.

It is a super-2 number, since 2×9977218839² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (63).

Its product of digits (13716864) is a multiple of the sum of its prime divisors (672).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9977218837) by changing a digit.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 18441909 + ... + 18442449.

It is an arithmetic number, because the mean of its divisors is an integer number (128519040).

Almost surely, 2^9977218839 is an apocalyptic number.

9977218839 is a deficient number, since it is larger than the sum of its proper divisors (8529522921).

9977218839 is a wasteful number, since it uses less digits than its factorization.

9977218839 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 682 (or 672 counting only the distinct ones).

The product of its digits is 13716864, while the sum is 63.

The square root of 9977218839 is about 99886.0292483388. The cubic root of 9977218839 is about 2152.7974286600.

The spelling of 9977218839 in words is "nine billion, nine hundred seventy-seven million, two hundred eighteen thousand, eight hundred thirty-nine".