72369982081 has 4 divisors (see below), whose sum is σ = 74704497664. Its totient is φ = 70035466500.

The previous prime is 72369982079. The next prime is 72369982121. The reversal of 72369982081 is 18028996327.

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 72369982081 - 2¹ = 72369982079 is a prime.

It is a super-2 number, since 2×72369982081² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72369985081) 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, 1167257745 + ... + 1167257806.

It is an arithmetic number, because the mean of its divisors is an integer number (18676124416).

Almost surely, 2^72369982081 is an apocalyptic number.

It is an amenable number.

72369982081 is a deficient number, since it is larger than the sum of its proper divisors (2334515583).

72369982081 is a wasteful number, since it uses less digits than its factorization.

72369982081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2334515582.

The product of its (nonzero) digits is 2612736, while the sum is 55.

The spelling of 72369982081 in words is "seventy-two billion, three hundred sixty-nine million, nine hundred eighty-two thousand, eighty-one".