11947777543 has 16 divisors (see below), whose sum is σ = 13550992000. Its totient is φ = 10442895840.

The previous prime is 11947777537. The next prime is 11947777571. The reversal of 11947777543 is 34577774911.

It is not a de Polignac number, because 11947777543 - 2⁵ = 11947777511 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11947777343) 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, 515008 + ... + 537706.

It is an arithmetic number, because the mean of its divisors is an integer number (846937000).

Almost surely, 2^11947777543 is an apocalyptic number.

11947777543 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

11947777543 is a deficient number, since it is larger than the sum of its proper divisors (1603214457).

11947777543 is a wasteful number, since it uses less digits than its factorization.

11947777543 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24862.

The product of its digits is 5186160, while the sum is 55.

The spelling of 11947777543 in words is "eleven billion, nine hundred forty-seven million, seven hundred seventy-seven thousand, five hundred forty-three".