11605256533 has 36 divisors (see below), whose sum is σ = 13931090208. Its totient is φ = 9643096320.

The previous prime is 11605256519. The next prime is 11605256543. The reversal of 11605256533 is 33565250611.

It is not a de Polignac number, because 11605256533 - 2¹³ = 11605248341 is a prime.

It is a Smith number, since the sum of its digits (37) coincides with the sum of the digits of its prime factors.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 11605256492 and 11605256501.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11605256513) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 1118178 + ... + 1128508.

It is an arithmetic number, because the mean of its divisors is an integer number (386974728).

Almost surely, 2^11605256533 is an apocalyptic number.

11605256533 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

11605256533 is a deficient number, since it is larger than the sum of its proper divisors (2325833675).

11605256533 is a wasteful number, since it uses less digits than its factorization.

11605256533 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10414 (or 10384 counting only the distinct ones).

The product of its (nonzero) digits is 81000, while the sum is 37.

The spelling of 11605256533 in words is "eleven billion, six hundred five million, two hundred fifty-six thousand, five hundred thirty-three".