2197684775979 has 72 divisors (see below), whose sum is σ = 4005134995680. Its totient is φ = 1136668135680.

The previous prime is 2197684775933. The next prime is 2197684775983. The reversal of 2197684775979 is 9795774867912.

2197684775979 is a `hidden beast` number, since 2 + 1 + 9 + 76 + 8 + 477 + 5 + 9 + 79 = 666.

It is not a de Polignac number, because 2197684775979 - 2⁸ = 2197684775723 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2197684775898 and 2197684775907.

It is not an unprimeable number, because it can be changed into a prime (2197684777979) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 1116199 + ... + 2375135.

It is an arithmetic number, because the mean of its divisors is an integer number (55626874940).

Almost surely, 2^{2197684775979} is an apocalyptic number.

2197684775979 is a deficient number, since it is larger than the sum of its proper divisors (1807450219701).

2197684775979 is a wasteful number, since it uses less digits than its factorization.

2197684775979 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1259201 (or 1259187 counting only the distinct ones).

The product of its digits is 3360631680, while the sum is 81.

The spelling of 2197684775979 in words is "two trillion, one hundred ninety-seven billion, six hundred eighty-four million, seven hundred seventy-five thousand, nine hundred seventy-nine".