169400009477 has 4 divisors (see below), whose sum is σ = 171303380460. Its totient is φ = 167496638496.

The previous prime is 169400009437. The next prime is 169400009479. The reversal of 169400009477 is 774900004961.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 101216877316 + 68183132161 = 318146^2 + 261119^2 .

It is a cyclic number.

It is not a de Polignac number, because 169400009477 - 2⁶ = 169400009413 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (169400009479) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 951685358 + ... + 951685535.

It is an arithmetic number, because the mean of its divisors is an integer number (42825845115).

Almost surely, 2^169400009477 is an apocalyptic number.

It is an amenable number.

169400009477 is a deficient number, since it is larger than the sum of its proper divisors (1903370983).

169400009477 is an equidigital number, since it uses as much as digits as its factorization.

169400009477 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1903370982.

The product of its (nonzero) digits is 381024, while the sum is 47.

The spelling of 169400009477 in words is "one hundred sixty-nine billion, four hundred million, nine thousand, four hundred seventy-seven".