189655556477 has 2 divisors, whose sum is σ = 189655556478. Its totient is φ = 189655556476.

The previous prime is 189655556393. The next prime is 189655556569. The reversal of 189655556477 is 774655556981.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 187819091161 + 1836465316 = 433381^2 + 42854^2 .

It is a cyclic number.

It is not a de Polignac number, because 189655556477 - 2¹² = 189655552381 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (189655556677) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 94827778238 + 94827778239.

It is an arithmetic number, because the mean of its divisors is an integer number (94827778239).

Almost surely, 2^189655556477 is an apocalyptic number.

It is an amenable number.

189655556477 is a deficient number, since it is larger than the sum of its proper divisors (1).

189655556477 is an equidigital number, since it uses as much as digits as its factorization.

189655556477 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 317520000, while the sum is 68.

The spelling of 189655556477 in words is "one hundred eighty-nine billion, six hundred fifty-five million, five hundred fifty-six thousand, four hundred seventy-seven".