1646916986979 has 24 divisors (see below), whose sum is σ = 2650357711872. Its totient is φ = 976894663920.

The previous prime is 1646916986921. The next prime is 1646916986987. The reversal of 1646916986979 is 9796896196461.

1646916986979 is a `hidden beast` number, since 1 + 6 + 469 + 1 + 6 + 9 + 86 + 9 + 79 = 666.

It is not a de Polignac number, because 1646916986979 - 2¹² = 1646916982883 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1646916986898 and 1646916986907.

It is not an unprimeable number, because it can be changed into a prime (1646916988979) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 176969019 + ... + 176978324.

It is an arithmetic number, because the mean of its divisors is an integer number (110431571328).

Almost surely, 2^{1646916986979} is an apocalyptic number.

1646916986979 is a deficient number, since it is larger than the sum of its proper divisors (1003440724893).

1646916986979 is a wasteful number, since it uses less digits than its factorization.

1646916986979 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 353947407 (or 353947404 counting only the distinct ones).

The product of its digits is 1904684544, while the sum is 81.

The spelling of 1646916986979 in words is "one trillion, six hundred forty-six billion, nine hundred sixteen million, nine hundred eighty-six thousand, nine hundred seventy-nine".