67139722621 has 4 divisors (see below), whose sum is σ = 69454885500. Its totient is φ = 64824559744.

The previous prime is 67139722619. The next prime is 67139722627. The reversal of 67139722621 is 12622793176.

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 46313192025 + 20826530596 = 215205^2 + 144314^2 .

It is a cyclic number.

It is not a de Polignac number, because 67139722621 - 2¹ = 67139722619 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (67139722627) 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, 1157581396 + ... + 1157581453.

It is an arithmetic number, because the mean of its divisors is an integer number (17363721375).

Almost surely, 2^67139722621 is an apocalyptic number.

It is an amenable number.

67139722621 is a deficient number, since it is larger than the sum of its proper divisors (2315162879).

67139722621 is a wasteful number, since it uses less digits than its factorization.

67139722621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2315162878.

The product of its digits is 381024, while the sum is 46.

The spelling of 67139722621 in words is "sixty-seven billion, one hundred thirty-nine million, seven hundred twenty-two thousand, six hundred twenty-one".