11661515105 has 8 divisors (see below), whose sum is σ = 13996599552. Its totient is φ = 9327357808.

The previous prime is 11661515087. The next prime is 11661515113. The reversal of 11661515105 is 50151516611.

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 11661515105 - 2¹⁸ = 11661252961 is a prime.

It is a super-2 number, since 2×11661515105² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 203807 + ... + 254676.

It is an arithmetic number, because the mean of its divisors is an integer number (1749574944).

Almost surely, 2^11661515105 is an apocalyptic number.

It is an amenable number.

11661515105 is a deficient number, since it is larger than the sum of its proper divisors (2335084447).

11661515105 is an equidigital number, since it uses as much as digits as its factorization.

11661515105 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 463575.

The product of its (nonzero) digits is 4500, while the sum is 32.

The spelling of 11661515105 in words is "eleven billion, six hundred sixty-one million, five hundred fifteen thousand, one hundred five".