11161501605 has 24 divisors (see below), whose sum is σ = 19414987488. Its totient is φ = 5931759456.

The previous prime is 11161501591. The next prime is 11161501639. The reversal of 11161501605 is 50610516111.

11161501605 is a `hidden beast` number, since 1 + 1 + 1 + 6 + 1 + 50 + 1 + 605 = 666.

It is not a de Polignac number, because 11161501605 - 2¹⁵ = 11161468837 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 425487 + ... + 450956.

It is an arithmetic number, because the mean of its divisors is an integer number (808957812).

Almost surely, 2^11161501605 is an apocalyptic number.

11161501605 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

11161501605 is a deficient number, since it is larger than the sum of its proper divisors (8253485883).

11161501605 is a wasteful number, since it uses less digits than its factorization.

11161501605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 876737 (or 876734 counting only the distinct ones).

The product of its (nonzero) digits is 900, while the sum is 27.

The spelling of 11161501605 in words is "eleven billion, one hundred sixty-one million, five hundred one thousand, six hundred five".