189477986417 has 2 divisors, whose sum is σ = 189477986418. Its totient is φ = 189477986416.

The previous prime is 189477986413. The next prime is 189477986437. The reversal of 189477986417 is 714689774981.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 156164070976 + 33313915441 = 395176^2 + 182521^2 .

It is a cyclic number.

It is not a de Polignac number, because 189477986417 - 2² = 189477986413 is a prime.

It is a super-3 number, since 3×189477986417³ (a number of 35 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (189477986413) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 94738993208 + 94738993209.

It is an arithmetic number, because the mean of its divisors is an integer number (94738993209).

Almost surely, 2^189477986417 is an apocalyptic number.

It is an amenable number.

189477986417 is a deficient number, since it is larger than the sum of its proper divisors (1).

189477986417 is an equidigital number, since it uses as much as digits as its factorization.

189477986417 is an evil number, because the sum of its binary digits is even.

The product of its digits is 170698752, while the sum is 71.

The spelling of 189477986417 in words is "one hundred eighty-nine billion, four hundred seventy-seven million, nine hundred eighty-six thousand, four hundred seventeen".