475194990989 has 2 divisors, whose sum is σ = 475194990990. Its totient is φ = 475194990988.

The previous prime is 475194990983. The next prime is 475194991021. The reversal of 475194990989 is 989099491574.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 269117125225 + 206077865764 = 518765^2 + 453958^2 .

It is a cyclic number.

It is not a de Polignac number, because 475194990989 - 2⁴ = 475194990973 is a prime.

It is a super-2 number, since 2×475194990989² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (475194990983) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 237597495494 + 237597495495.

It is an arithmetic number, because the mean of its divisors is an integer number (237597495495).

Almost surely, 2^475194990989 is an apocalyptic number.

It is an amenable number.

475194990989 is a deficient number, since it is larger than the sum of its proper divisors (1).

475194990989 is an equidigital number, since it uses as much as digits as its factorization.

475194990989 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 264539520, while the sum is 74.

The spelling of 475194990989 in words is "four hundred seventy-five billion, one hundred ninety-four million, nine hundred ninety thousand, nine hundred eighty-nine".