83569819572409 has 9 divisors (see below), whose sum is σ = 83670361333797. Its totient is φ = 83469398514204.

The previous prime is 83569819572391. The next prime is 83569819572427. The reversal of 83569819572409 is 90427591896538.

It is a happy number.

The square root of 83569819572409 is 9141653.

It is a perfect power (a square), and thus also a powerful number.

It is an interprime number because it is at equal distance from previous prime (83569819572391) and next prime (83569819572427).

It is not a de Polignac number, because 83569819572409 - 2²³ = 83569811183801 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (83569819272409) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 8291474232 + ... + 8291484310.

It is a 1-persistent number, because it is pandigital, but 2⋅83569819572409 = 167139639144818 is not.

Almost surely, 2^{83569819572409} is an apocalyptic number.

83569819572409 is the 9141653-rd square number.

83569819572409 is the 4570827-th centered octagonal number.

It is an amenable number.

83569819572409 is a deficient number, since it is larger than the sum of its proper divisors (100541761388).

83569819572409 is an frugal number, since it uses more digits than its factorization.

83569819572409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21972 (or 10986 counting only the distinct ones).

The product of its (nonzero) digits is 1175731200, while the sum is 76.

The spelling of 83569819572409 in words is "eighty-three trillion, five hundred sixty-nine billion, eight hundred nineteen million, five hundred seventy-two thousand, four hundred nine".