11639149581 has 4 divisors (see below), whose sum is σ = 15518866112. Its totient is φ = 7759433052.

The previous prime is 11639149579. The next prime is 11639149583. The reversal of 11639149581 is 18594193611.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (11639149579) and next prime (11639149583).

It is not a de Polignac number, because 11639149581 - 2¹ = 11639149579 is a prime.

It is a super-2 number, since 2×11639149581² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 11639149581.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11639149583) 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 3 ways as a sum of consecutive naturals, for example, 1939858261 + ... + 1939858266.

It is an arithmetic number, because the mean of its divisors is an integer number (3879716528).

Almost surely, 2^11639149581 is an apocalyptic number.

It is an amenable number.

11639149581 is a deficient number, since it is larger than the sum of its proper divisors (3879716531).

11639149581 is an equidigital number, since it uses as much as digits as its factorization.

11639149581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3879716530.

The product of its digits is 233280, while the sum is 48.

The spelling of 11639149581 in words is "eleven billion, six hundred thirty-nine million, one hundred forty-nine thousand, five hundred eighty-one".