72155116215701 has 4 divisors (see below), whose sum is σ = 72156553017804. Its totient is φ = 72153679413600.

The previous prime is 72155116215673. The next prime is 72155116215719. The reversal of 72155116215701 is 10751261155127.

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 47535647052100 + 24619469163601 = 6894610^2 + 4961801^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-72155116215701 is a prime.

It is a super-2 number, since 2×72155116215701² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72155116215761) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 718325720 + ... + 718426161.

It is an arithmetic number, because the mean of its divisors is an integer number (18039138254451).

Almost surely, 2^{72155116215701} is an apocalyptic number.

It is an amenable number.

72155116215701 is a deficient number, since it is larger than the sum of its proper divisors (1436802103).

72155116215701 is a wasteful number, since it uses less digits than its factorization.

72155116215701 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1436802102.

The product of its (nonzero) digits is 147000, while the sum is 44.

The spelling of 72155116215701 in words is "seventy-two trillion, one hundred fifty-five billion, one hundred sixteen million, two hundred fifteen thousand, seven hundred one".