19982699977 has 4 divisors (see below), whose sum is σ = 19988524180. Its totient is φ = 19976875776.

The previous prime is 19982699959. The next prime is 19982699987. The reversal of 19982699977 is 77999628991.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 15360875721 + 4621824256 = 123939^2 + 67984^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19982699977 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19982699987) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2906952 + ... + 2913817.

It is an arithmetic number, because the mean of its divisors is an integer number (4997131045).

Almost surely, 2^19982699977 is an apocalyptic number.

It is an amenable number.

19982699977 is a deficient number, since it is larger than the sum of its proper divisors (5824203).

19982699977 is an equidigital number, since it uses as much as digits as its factorization.

19982699977 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5824202.

The product of its digits is 277766496, while the sum is 76.

The spelling of 19982699977 in words is "nineteen billion, nine hundred eighty-two million, six hundred ninety-nine thousand, nine hundred seventy-seven".