11945646461 has 4 divisors (see below), whose sum is σ = 13652167392. Its totient is φ = 10239125532.

The previous prime is 11945646457. The next prime is 11945646473. The reversal of 11945646461 is 16464654911.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 11945646461 - 2² = 11945646457 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11945646421) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 853260455 + ... + 853260468.

It is an arithmetic number, because the mean of its divisors is an integer number (3413041848).

Almost surely, 2^11945646461 is an apocalyptic number.

It is an amenable number.

11945646461 is a deficient number, since it is larger than the sum of its proper divisors (1706520931).

11945646461 is an equidigital number, since it uses as much as digits as its factorization.

11945646461 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1706520930.

The product of its digits is 622080, while the sum is 47.

The spelling of 11945646461 in words is "eleven billion, nine hundred forty-five million, six hundred forty-six thousand, four hundred sixty-one".