72150065155661 has 4 divisors (see below), whose sum is σ = 72196523666652. Its totient is φ = 72103606644672.

The previous prime is 72150065155607. The next prime is 72150065155669. The reversal of 72150065155661 is 16655156005127.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 47330189533636 + 24819875622025 = 6879694^2 + 4981955^2 .

It is a cyclic number.

It is not a de Polignac number, because 72150065155661 - 2¹⁰ = 72150065154637 is a prime.

It is a super-2 number, since 2×72150065155661² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72150065155669) 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, 23229253166 + ... + 23229256271.

It is an arithmetic number, because the mean of its divisors is an integer number (18049130916663).

Almost surely, 2^{72150065155661} is an apocalyptic number.

It is an amenable number.

72150065155661 is a deficient number, since it is larger than the sum of its proper divisors (46458510991).

72150065155661 is a wasteful number, since it uses less digits than its factorization.

72150065155661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46458510990.

The product of its (nonzero) digits is 1890000, while the sum is 50.

The spelling of 72150065155661 in words is "seventy-two trillion, one hundred fifty billion, sixty-five million, one hundred fifty-five thousand, six hundred sixty-one".