11728665905 has 32 divisors (see below), whose sum is σ = 15737839488. Its totient is φ = 8319168000.

The previous prime is 11728665887. The next prime is 11728665941. The reversal of 11728665905 is 50956682711.

It is not a de Polignac number, because 11728665905 - 2⁸ = 11728665649 is a prime.

It is a super-2 number, since 2×11728665905² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 356429 + ... + 387941.

It is an arithmetic number, because the mean of its divisors is an integer number (491807484).

Almost surely, 2^11728665905 is an apocalyptic number.

It is an amenable number.

11728665905 is a deficient number, since it is larger than the sum of its proper divisors (4009173583).

11728665905 is a wasteful number, since it uses less digits than its factorization.

11728665905 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31697.

The product of its (nonzero) digits is 907200, while the sum is 50.

The spelling of 11728665905 in words is "eleven billion, seven hundred twenty-eight million, six hundred sixty-five thousand, nine hundred five".