11505978530 has 8 divisors (see below), whose sum is σ = 20710761372. Its totient is φ = 4602391408.

The previous prime is 11505978511. The next prime is 11505978577. The reversal of 11505978530 is 3587950511.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 11498487361 + 7491169 = 107231^2 + 2737^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 575298917 + ... + 575298936.

Almost surely, 2^11505978530 is an apocalyptic number.

11505978530 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

11505978530 is a deficient number, since it is larger than the sum of its proper divisors (9204782842).

11505978530 is a wasteful number, since it uses less digits than its factorization.

11505978530 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1150597860.

The product of its (nonzero) digits is 189000, while the sum is 44.

The spelling of 11505978530 in words is "eleven billion, five hundred five million, nine hundred seventy-eight thousand, five hundred thirty".