11558033981 has 16 divisors (see below), whose sum is σ = 12738337920. Its totient is φ = 10422095040.

The previous prime is 11558033959. The next prime is 11558033983. The reversal of 11558033981 is 18933085511.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 11558033981 - 2²² = 11553839677 is a prime.

It is a super-2 number, since 2×11558033981² (a number of 21 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 (11558033983) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 43166 + ... + 158048.

It is an arithmetic number, because the mean of its divisors is an integer number (796146120).

Almost surely, 2^11558033981 is an apocalyptic number.

It is an amenable number.

11558033981 is a deficient number, since it is larger than the sum of its proper divisors (1180303939).

11558033981 is a wasteful number, since it uses less digits than its factorization.

11558033981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 115076.

The product of its (nonzero) digits is 129600, while the sum is 44.

The spelling of 11558033981 in words is "eleven billion, five hundred fifty-eight million, thirty-three thousand, nine hundred eighty-one".