946664561 has 4 divisors (see below), whose sum is σ = 946741824. Its totient is φ = 946587300.

The previous prime is 946664527. The next prime is 946664597. The reversal of 946664561 is 165466649.

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, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 946664561 - 2¹⁸ = 946402417 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (946661561) 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, 15725 + ... + 46266.

It is an arithmetic number, because the mean of its divisors is an integer number (236685456).

Almost surely, 2^946664561 is an apocalyptic number.

It is an amenable number.

946664561 is a deficient number, since it is larger than the sum of its proper divisors (77263).

946664561 is a wasteful number, since it uses less digits than its factorization.

946664561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77262.

The product of its digits is 933120, while the sum is 47.

The square root of 946664561 is about 30767.9144727100. The cubic root of 946664561 is about 981.8957338591.

The spelling of 946664561 in words is "nine hundred forty-six million, six hundred sixty-four thousand, five hundred sixty-one".