20177869819 has 2 divisors, whose sum is σ = 20177869820. Its totient is φ = 20177869818.

The previous prime is 20177869763. The next prime is 20177869849. The reversal of 20177869819 is 91896877102.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20177869819 - 2²⁷ = 20043652091 is a prime.

It is a super-2 number, since 2×20177869819² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (20177869849) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10088934909 + 10088934910.

It is an arithmetic number, because the mean of its divisors is an integer number (10088934910).

Almost surely, 2^20177869819 is an apocalyptic number.

20177869819 is a deficient number, since it is larger than the sum of its proper divisors (1).

20177869819 is an equidigital number, since it uses as much as digits as its factorization.

20177869819 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3048192, while the sum is 58.

The spelling of 20177869819 in words is "twenty billion, one hundred seventy-seven million, eight hundred sixty-nine thousand, eight hundred nineteen".