825899617511 has 4 divisors (see below), whose sum is σ = 825901472400. Its totient is φ = 825897762624.

The previous prime is 825899617453. The next prime is 825899617547. The reversal of 825899617511 is 115716998528.

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

It is a cyclic number.

It is not a de Polignac number, because 825899617511 - 2¹⁸ = 825899355367 is a prime.

It is a super-2 number, since 2×825899617511² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (825899317511) 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, 186110 + ... + 1298628.

It is an arithmetic number, because the mean of its divisors is an integer number (206475368100).

Almost surely, 2^825899617511 is an apocalyptic number.

825899617511 is a deficient number, since it is larger than the sum of its proper divisors (1854889).

825899617511 is a wasteful number, since it uses less digits than its factorization.

825899617511 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1854888.

The product of its digits is 10886400, while the sum is 62.

The spelling of 825899617511 in words is "eight hundred twenty-five billion, eight hundred ninety-nine million, six hundred seventeen thousand, five hundred eleven".