12011999465 has 4 divisors (see below), whose sum is σ = 14414399364. Its totient is φ = 9609599568.

The previous prime is 12011999459. The next prime is 12011999521. The reversal of 12011999465 is 56499911021.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 56499911021 = 53 ⋅1066036057.

It can be written as a sum of positive squares in 2 ways, for example, as 6361019536 + 5650979929 = 79756^2 + 75173^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12011999465 is a prime.

It is a super-2 number, since 2×12011999465² (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 3 ways as a sum of consecutive naturals, for example, 1201199942 + ... + 1201199951.

It is an arithmetic number, because the mean of its divisors is an integer number (3603599841).

Almost surely, 2^12011999465 is an apocalyptic number.

It is an amenable number.

12011999465 is a deficient number, since it is larger than the sum of its proper divisors (2402399899).

12011999465 is an equidigital number, since it uses as much as digits as its factorization.

12011999465 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2402399898.

The product of its (nonzero) digits is 174960, while the sum is 47.

The spelling of 12011999465 in words is "twelve billion, eleven million, nine hundred ninety-nine thousand, four hundred sixty-five".