11556421766547 has 16 divisors (see below), whose sum is σ = 17619157501440. Its totient is φ = 6600155098752.

The previous prime is 11556421766473. The next prime is 11556421766563. The reversal of 11556421766547 is 74566712465511.

It is a happy number.

It is not a de Polignac number, because 11556421766547 - 2²⁸ = 11556153331091 is a prime.

It is not an unprimeable number, because it can be changed into a prime (11556421766147) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 146396358 + ... + 146475275.

It is an arithmetic number, because the mean of its divisors is an integer number (1101197343840).

Almost surely, 2^{11556421766547} is an apocalyptic number.

11556421766547 is a deficient number, since it is larger than the sum of its proper divisors (6062735734893).

11556421766547 is a wasteful number, since it uses less digits than its factorization.

11556421766547 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 292873522.

The product of its digits is 42336000, while the sum is 60.

The spelling of 11556421766547 in words is "eleven trillion, five hundred fifty-six billion, four hundred twenty-one million, seven hundred sixty-six thousand, five hundred forty-seven".