11556421766451 has 12 divisors (see below), whose sum is σ = 16728353569512. Its totient is φ = 7687783784736.

The previous prime is 11556421766399. The next prime is 11556421766473. The reversal of 11556421766451 is 15466712465511.

11556421766451 is a `hidden beast` number, since 1 + 1 + 5 + 564 + 2 + 1 + 76 + 6 + 4 + 5 + 1 = 666.

It is not a de Polignac number, because 11556421766451 - 2¹⁴ = 11556421750067 is a prime.

It is not an unprimeable number, because it can be changed into a prime (11556421746451) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1374778306 + ... + 1374786711.

It is an arithmetic number, because the mean of its divisors is an integer number (1394029464126).

Almost surely, 2^{11556421766451} is an apocalyptic number.

11556421766451 is a deficient number, since it is larger than the sum of its proper divisors (5171931803061).

11556421766451 is a wasteful number, since it uses less digits than its factorization.

11556421766451 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2749565490 (or 2749565487 counting only the distinct ones).

The product of its digits is 6048000, while the sum is 54.

The spelling of 11556421766451 in words is "eleven trillion, five hundred fifty-six billion, four hundred twenty-one million, seven hundred sixty-six thousand, four hundred fifty-one".