11487566578961 has 16 divisors (see below), whose sum is σ = 12636037022400. Its totient is φ = 10356560947200.

The previous prime is 11487566578931. The next prime is 11487566578963. The reversal of 11487566578961 is 16987566578411.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11487566578961 is a prime.

It is not an unprimeable number, because it can be changed into a prime (11487566578963) 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, 531296 + ... + 4822593.

It is an arithmetic number, because the mean of its divisors is an integer number (789752313900).

Almost surely, 2^{11487566578961} is an apocalyptic number.

11487566578961 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

11487566578961 is a deficient number, since it is larger than the sum of its proper divisors (1148470443439).

11487566578961 is a wasteful number, since it uses less digits than its factorization.

11487566578961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5355520.

The product of its digits is 609638400, while the sum is 74.

The spelling of 11487566578961 in words is "eleven trillion, four hundred eighty-seven billion, five hundred sixty-six million, five hundred seventy-eight thousand, nine hundred sixty-one".