11555342505 has 24 divisors (see below), whose sum is σ = 22890583872. Its totient is φ = 5282442144.

The previous prime is 11555342503. The next prime is 11555342507. The reversal of 11555342505 is 50524355511.

11555342505 is a `hidden beast` number, since 1 + 15 + 553 + 42 + 50 + 5 = 666.

It is an interprime number because it is at equal distance from previous prime (11555342503) and next prime (11555342507).

It is not a de Polignac number, because 11555342505 - 2¹ = 11555342503 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 11555342505.

It is not an unprimeable number, because it can be changed into a prime (11555342503) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 18341499 + ... + 18342128.

It is an arithmetic number, because the mean of its divisors is an integer number (953774328).

Almost surely, 2^11555342505 is an apocalyptic number.

11555342505 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

11555342505 is a deficient number, since it is larger than the sum of its proper divisors (11335241367).

11555342505 is a wasteful number, since it uses less digits than its factorization.

11555342505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36683645 (or 36683642 counting only the distinct ones).

The product of its (nonzero) digits is 75000, while the sum is 36.

The spelling of 11555342505 in words is "eleven billion, five hundred fifty-five million, three hundred forty-two thousand, five hundred five".