11649501881 has 8 divisors (see below), whose sum is σ = 11757898440. Its totient is φ = 11541198592.

The previous prime is 11649501839. The next prime is 11649501883. The reversal of 11649501881 is 18810594611.

It can be written as a sum of positive squares in 4 ways, for example, as 1465664656 + 10183837225 = 38284^2 + 100915^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 11649501881 - 2²² = 11645307577 is a prime.

It is a super-2 number, since 2×11649501881² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11649501883) 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 in 7 ways as a sum of consecutive naturals, for example, 241535 + ... + 285723.

It is an arithmetic number, because the mean of its divisors is an integer number (1469737305).

Almost surely, 2^11649501881 is an apocalyptic number.

It is an amenable number.

11649501881 is a deficient number, since it is larger than the sum of its proper divisors (108396559).

11649501881 is a wasteful number, since it uses less digits than its factorization.

11649501881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46635.

The product of its (nonzero) digits is 69120, while the sum is 44.

The spelling of 11649501881 in words is "eleven billion, six hundred forty-nine million, five hundred one thousand, eight hundred eighty-one".