537667422221 has 4 divisors (see below), whose sum is σ = 537685909500. Its totient is φ = 537648934944.

The previous prime is 537667422203. The next prime is 537667422241. The reversal of 537667422221 is 122224766735.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 122224766735 = 5 ⋅24444953347.

It can be written as a sum of positive squares in 2 ways, for example, as 45405217225 + 492262204996 = 213085^2 + 701614^2 .

It is a cyclic number.

It is not a de Polignac number, because 537667422221 - 2¹⁰ = 537667421197 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 (537667422241) 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, 9199946 + ... + 9258203.

It is an arithmetic number, because the mean of its divisors is an integer number (134421477375).

Almost surely, 2^537667422221 is an apocalyptic number.

It is an amenable number.

537667422221 is a deficient number, since it is larger than the sum of its proper divisors (18487279).

537667422221 is a wasteful number, since it uses less digits than its factorization.

537667422221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18487278.

The product of its digits is 1693440, while the sum is 47.

The spelling of 537667422221 in words is "five hundred thirty-seven billion, six hundred sixty-seven million, four hundred twenty-two thousand, two hundred twenty-one".