11997556546 has 16 divisors (see below), whose sum is σ = 18130904064. Its totient is φ = 5954082624.

The previous prime is 11997556541. The next prime is 11997556561. The reversal of 11997556546 is 64565579911.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (11997556541) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 110391 + ... + 190213.

It is an arithmetic number, because the mean of its divisors is an integer number (1133181504).

Almost surely, 2^11997556546 is an apocalyptic number.

11997556546 is a deficient number, since it is larger than the sum of its proper divisors (6133347518).

11997556546 is a wasteful number, since it uses less digits than its factorization.

11997556546 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80385.

The product of its digits is 10206000, while the sum is 58.

The spelling of 11997556546 in words is "eleven billion, nine hundred ninety-seven million, five hundred fifty-six thousand, five hundred forty-six".