20163677977 has 2 divisors, whose sum is σ = 20163677978. Its totient is φ = 20163677976.

The previous prime is 20163677969. The next prime is 20163677981. The reversal of 20163677977 is 77977636102.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11516723856 + 8646954121 = 107316^2 + 92989^2 .

It is a cyclic number.

It is not a de Polignac number, because 20163677977 - 2³ = 20163677969 is a prime.

It is not a weakly prime, because it can be changed into another prime (20163677077) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10081838988 + 10081838989.

It is an arithmetic number, because the mean of its divisors is an integer number (10081838989).

Almost surely, 2^20163677977 is an apocalyptic number.

It is an amenable number.

20163677977 is a deficient number, since it is larger than the sum of its proper divisors (1).

20163677977 is an equidigital number, since it uses as much as digits as its factorization.

20163677977 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4667544, while the sum is 55.

The spelling of 20163677977 in words is "twenty billion, one hundred sixty-three million, six hundred seventy-seven thousand, nine hundred seventy-seven".