72861663722 has 4 divisors (see below), whose sum is σ = 109292495586. Its totient is φ = 36430831860.

The previous prime is 72861663703. The next prime is 72861663751. The reversal of 72861663722 is 22736616827.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 22736616827 = 120383 ⋅188869.

It can be written as a sum of positive squares in only one way, i.e., 72841151881 + 20511841 = 269891^2 + 4529^2 .

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 18215415929 + ... + 18215415932.

Almost surely, 2^72861663722 is an apocalyptic number.

72861663722 is a deficient number, since it is larger than the sum of its proper divisors (36430831864).

72861663722 is a wasteful number, since it uses less digits than its factorization.

72861663722 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36430831863.

The product of its digits is 2032128, while the sum is 50.

The spelling of 72861663722 in words is "seventy-two billion, eight hundred sixty-one million, six hundred sixty-three thousand, seven hundred twenty-two".