72155220100720 has 80 divisors (see below), whose sum is σ = 175067341972992. Its totient is φ = 27605242748160.

The previous prime is 72155220100693. The next prime is 72155220100721. The reversal of 72155220100720 is 2700102255127.

It is a tau number, because it is divible by the number of its divisors (80).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72155220100721) 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, 24497179 + ... + 27284101.

Almost surely, 2^{72155220100720} is an apocalyptic number.

It is an amenable number.

72155220100720 is an abundant number, since it is smaller than the sum of its proper divisors (102912121872272).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

72155220100720 is a wasteful number, since it uses less digits than its factorization.

72155220100720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2801030 (or 2801024 counting only the distinct ones).

The product of its (nonzero) digits is 19600, while the sum is 34.

Adding to 72155220100720 its reverse (2700102255127), we get a palindrome (74855322355847).

The spelling of 72155220100720 in words is "seventy-two trillion, one hundred fifty-five billion, two hundred twenty million, one hundred thousand, seven hundred twenty".