72120201715655 has 8 divisors (see below), whose sum is σ = 87117382735584. Its totient is φ = 57314067588000.

The previous prime is 72120201715649. The next prime is 72120201715717. The reversal of 72120201715655 is 55651710202127.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 72120201715655 - 2²⁰ = 72120200667079 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 47761722236 + ... + 47761723745.

It is an arithmetic number, because the mean of its divisors is an integer number (10889672841948).

Almost surely, 2^{72120201715655} is an apocalyptic number.

72120201715655 is a deficient number, since it is larger than the sum of its proper divisors (14997181019929).

72120201715655 is a wasteful number, since it uses less digits than its factorization.

72120201715655 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 95523446137.

The product of its (nonzero) digits is 294000, while the sum is 44.

The spelling of 72120201715655 in words is "seventy-two trillion, one hundred twenty billion, two hundred one million, seven hundred fifteen thousand, six hundred fifty-five".