72155505706720 has 48 divisors (see below), whose sum is σ = 180494875311408. Its totient is φ = 27164425676800.

The previous prime is 72155505706633. The next prime is 72155505706727. The reversal of 72155505706720 is 2760750555127.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72155505706727) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13263877006 + ... + 13263882445.

It is an arithmetic number, because the mean of its divisors is an integer number (3760309902321).

Almost surely, 2^{72155505706720} is an apocalyptic number.

It is an amenable number.

72155505706720 is an abundant number, since it is smaller than the sum of its proper divisors (108339369604688).

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

72155505706720 is a wasteful number, since it uses less digits than its factorization.

72155505706720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26527759483 (or 26527759475 counting only the distinct ones).

The product of its (nonzero) digits is 5145000, while the sum is 52.

The spelling of 72155505706720 in words is "seventy-two trillion, one hundred fifty-five billion, five hundred five million, seven hundred six thousand, seven hundred twenty".