72656451946 has 24 divisors (see below), whose sum is σ = 124954945164. Its totient is φ = 31561171200.

The previous prime is 72656451941. The next prime is 72656451971. The reversal of 72656451946 is 64915465627.

It can be written as a sum of positive squares in 6 ways, for example, as 3031713721 + 69624738225 = 55061^2 + 263865^2 .

It is not an unprimeable number, because it can be changed into a prime (72656451941) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6316605 + ... + 6328096.

Almost surely, 2^72656451946 is an apocalyptic number.

72656451946 is a deficient number, since it is larger than the sum of its proper divisors (52298493218).

72656451946 is a wasteful number, since it uses less digits than its factorization.

72656451946 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12644746 (or 12644733 counting only the distinct ones).

The product of its digits is 10886400, while the sum is 55.

The spelling of 72656451946 in words is "seventy-two billion, six hundred fifty-six million, four hundred fifty-one thousand, nine hundred forty-six".