11151561555 has 48 divisors (see below), whose sum is σ = 19519250400. Its totient is φ = 5889329664.

The previous prime is 11151561527. The next prime is 11151561557. The reversal of 11151561555 is 55516515111.

11151561555 is a `hidden beast` number, since 1 + 1 + 1 + 51 + 56 + 1 + 555 = 666.

It is not a de Polignac number, because 11151561555 - 2¹³ = 11151553363 is a prime.

It is a super-2 number, since 2×11151561555² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (11151561557) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2324239 + ... + 2329031.

It is an arithmetic number, because the mean of its divisors is an integer number (406651050).

Almost surely, 2^11151561555 is an apocalyptic number.

11151561555 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

11151561555 is a deficient number, since it is larger than the sum of its proper divisors (8367688845).

11151561555 is a wasteful number, since it uses less digits than its factorization.

11151561555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5300 (or 5297 counting only the distinct ones).

The product of its digits is 18750, while the sum is 36.

The spelling of 11151561555 in words is "eleven billion, one hundred fifty-one million, five hundred sixty-one thousand, five hundred fifty-five".