11616780521 has 8 divisors (see below), whose sum is σ = 11894463360. Its totient is φ = 11340369328.

The previous prime is 11616780479. The next prime is 11616780547. The reversal of 11616780521 is 12508761611.

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

It is a cyclic number.

It is not a de Polignac number, because 11616780521 - 2¹⁸ = 11616518377 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11616980521) 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, 299411 + ... + 335976.

It is an arithmetic number, because the mean of its divisors is an integer number (1486807920).

Almost surely, 2^11616780521 is an apocalyptic number.

It is an amenable number.

11616780521 is a deficient number, since it is larger than the sum of its proper divisors (277682839).

11616780521 is an equidigital number, since it uses as much as digits as its factorization.

11616780521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 635823.

The product of its (nonzero) digits is 20160, while the sum is 38.

The spelling of 11616780521 in words is "eleven billion, six hundred sixteen million, seven hundred eighty thousand, five hundred twenty-one".