42446636561 has 16 divisors (see below), whose sum is σ = 50311958400. Its totient is φ = 35786373840.

The previous prime is 42446636539. The next prime is 42446636587. The reversal of 42446636561 is 16563664424.

It is a de Polignac number, because none of the positive numbers 2^k-42446636561 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42446606561) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 993431 + ... + 1035276.

It is an arithmetic number, because the mean of its divisors is an integer number (3144497400).

Almost surely, 2^42446636561 is an apocalyptic number.

It is an amenable number.

42446636561 is a deficient number, since it is larger than the sum of its proper divisors (7865321839).

42446636561 is an equidigital number, since it uses as much as digits as its factorization.

42446636561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2028789 (or 2028775 counting only the distinct ones).

The product of its digits is 2488320, while the sum is 47.

The spelling of 42446636561 in words is "forty-two billion, four hundred forty-six million, six hundred thirty-six thousand, five hundred sixty-one".