11709702578 has 54 divisors (see below), whose sum is σ = 21738640221. Its totient is φ = 4715895744.

The previous prime is 11709702559. The next prime is 11709702581. The reversal of 11709702578 is 87520790711.

It can be written as a sum of positive squares in 2 ways, for example, as 10717011529 + 992691049 = 103523^2 + 31507^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=76517.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 18210725 + ... + 18211367.

Almost surely, 2^11709702578 is an apocalyptic number.

11709702578 is a deficient number, since it is larger than the sum of its proper divisors (10028937643).

11709702578 is an frugal number, since it uses more digits than its factorization.

11709702578 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1336 (or 669 counting only the distinct ones).

The product of its (nonzero) digits is 246960, while the sum is 47.

The spelling of 11709702578 in words is "eleven billion, seven hundred nine million, seven hundred two thousand, five hundred seventy-eight".