19989089077 has 2 divisors, whose sum is σ = 19989089078. Its totient is φ = 19989089076.

The previous prime is 19989089053. The next prime is 19989089089. The reversal of 19989089077 is 77098098991.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12168516721 + 7820572356 = 110311^2 + 88434^2 .

It is a cyclic number.

It is not a de Polignac number, because 19989089077 - 2⁷ = 19989088949 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19989089377) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9994544538 + 9994544539.

It is an arithmetic number, because the mean of its divisors is an integer number (9994544539).

Almost surely, 2^19989089077 is an apocalyptic number.

It is an amenable number.

19989089077 is a deficient number, since it is larger than the sum of its proper divisors (1).

19989089077 is an equidigital number, since it uses as much as digits as its factorization.

19989089077 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 20575296, while the sum is 67.

The spelling of 19989089077 in words is "nineteen billion, nine hundred eighty-nine million, eighty-nine thousand, seventy-seven".