11946872645 has 4 divisors (see below), whose sum is σ = 14336247180. Its totient is φ = 9557498112.

The previous prime is 11946872633. The next prime is 11946872677. The reversal of 11946872645 is 54627864911.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 54627864911 = 74873 ⋅729607.

It can be written as a sum of positive squares in 2 ways, for example, as 7976990596 + 3969882049 = 89314^2 + 63007^2 .

It is a cyclic number.

It is not a de Polignac number, because 11946872645 - 2¹⁰ = 11946871621 is a prime.

It is a congruent 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, 1194687260 + ... + 1194687269.

It is an arithmetic number, because the mean of its divisors is an integer number (3584061795).

Almost surely, 2^11946872645 is an apocalyptic number.

It is an amenable number.

11946872645 is a deficient number, since it is larger than the sum of its proper divisors (2389374535).

11946872645 is an equidigital number, since it uses as much as digits as its factorization.

11946872645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2389374534.

The product of its digits is 2903040, while the sum is 53.

The spelling of 11946872645 in words is "eleven billion, nine hundred forty-six million, eight hundred seventy-two thousand, six hundred forty-five".