1988959555477 has 2 divisors, whose sum is σ = 1988959555478. Its totient is φ = 1988959555476.

The previous prime is 1988959555447. The next prime is 1988959555481. The reversal of 1988959555477 is 7745559598891.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1571177013156 + 417782542321 = 1253466^2 + 646361^2 .

It is a cyclic number.

It is not a de Polignac number, because 1988959555477 - 2²³ = 1988951166869 is a prime.

It is a super-2 number, since 2×1988959555477² (a number of 25 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1988959555477.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1988959555447) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 994479777738 + 994479777739.

It is an arithmetic number, because the mean of its divisors is an integer number (994479777739).

Almost surely, 2^{1988959555477} is an apocalyptic number.

It is an amenable number.

1988959555477 is a deficient number, since it is larger than the sum of its proper divisors (1).

1988959555477 is an equidigital number, since it uses as much as digits as its factorization.

1988959555477 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5715360000, while the sum is 82.

The spelling of 1988959555477 in words is "one trillion, nine hundred eighty-eight billion, nine hundred fifty-nine million, five hundred fifty-five thousand, four hundred seventy-seven".