72160042167421 has 4 divisors (see below), whose sum is σ = 77710814641852. Its totient is φ = 66609269692992.

The previous prime is 72160042167419. The next prime is 72160042167427. The reversal of 72160042167421 is 12476124006127.

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 7895144628900 + 64264897538521 = 2809830^2 + 8016539^2 .

It is not a de Polignac number, because 72160042167421 - 2¹ = 72160042167419 is a prime.

It is a super-2 number, since 2×72160042167421² (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 (72160042167427) 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, 2775386237196 + ... + 2775386237221.

It is an arithmetic number, because the mean of its divisors is an integer number (19427703660463).

Almost surely, 2^{72160042167421} is an apocalyptic number.

It is an amenable number.

72160042167421 is a deficient number, since it is larger than the sum of its proper divisors (5550772474431).

72160042167421 is a wasteful number, since it uses less digits than its factorization.

72160042167421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5550772474430.

The product of its (nonzero) digits is 225792, while the sum is 43.

The spelling of 72160042167421 in words is "seventy-two trillion, one hundred sixty billion, forty-two million, one hundred sixty-seven thousand, four hundred twenty-one".