11261603551 has 32 divisors (see below), whose sum is σ = 13166157312. Its totient is φ = 9529618560.

The previous prime is 11261603543. The next prime is 11261603567. The reversal of 11261603551 is 15530616211.

It is a happy number.

It is not a de Polignac number, because 11261603551 - 2³ = 11261603543 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11261603051) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3185781 + ... + 3189313.

It is an arithmetic number, because the mean of its divisors is an integer number (411442416).

Almost surely, 2^11261603551 is an apocalyptic number.

11261603551 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

11261603551 is a deficient number, since it is larger than the sum of its proper divisors (1904553761).

11261603551 is a wasteful number, since it uses less digits than its factorization.

11261603551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3903.

The product of its (nonzero) digits is 5400, while the sum is 31.

The spelling of 11261603551 in words is "eleven billion, two hundred sixty-one million, six hundred three thousand, five hundred fifty-one".