11555061601491 has 12 divisors (see below), whose sum is σ = 16690675413360. Its totient is φ = 7703360149680.

The previous prime is 11555061601469. The next prime is 11555061601513. The reversal of 11555061601491 is 19410616055511.

11555061601491 is a `hidden beast` number, since 1 + 1 + 5 + 550 + 6 + 1 + 6 + 0 + 1 + 4 + 91 = 666.

It is an interprime number because it is at equal distance from previous prime (11555061601469) and next prime (11555061601513).

It is not a de Polignac number, because 11555061601491 - 2⁴² = 7157015090387 is a prime.

It is a super-2 number, since 2×11555061601491² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (11555061601891) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6715545 + ... + 8258853.

It is an arithmetic number, because the mean of its divisors is an integer number (1390889617780).

Almost surely, 2^{11555061601491} is an apocalyptic number.

11555061601491 is a deficient number, since it is larger than the sum of its proper divisors (5135613811869).

11555061601491 is a wasteful number, since it uses less digits than its factorization.

11555061601491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2375226 (or 2375223 counting only the distinct ones).

The product of its (nonzero) digits is 162000, while the sum is 45.

The spelling of 11555061601491 in words is "eleven trillion, five hundred fifty-five billion, sixty-one million, six hundred one thousand, four hundred ninety-one".