667542237236531 has 2 divisors, whose sum is σ = 667542237236532. Its totient is φ = 667542237236530.

The previous prime is 667542237236467. The next prime is 667542237236587. The reversal of 667542237236531 is 135632732245766.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 667542237236531 - 2⁶ = 667542237236467 is a prime.

It is a super-2 number, since 2×667542237236531² (a number of 30 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (667542237296531) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 333771118618265 + 333771118618266.

It is an arithmetic number, because the mean of its divisors is an integer number (333771118618266).

Almost surely, 2^{667542237236531} is an apocalyptic number.

667542237236531 is a deficient number, since it is larger than the sum of its proper divisors (1).

667542237236531 is an equidigital number, since it uses as much as digits as its factorization.

667542237236531 is an evil number, because the sum of its binary digits is even.

The product of its digits is 228614400, while the sum is 62.

The spelling of 667542237236531 in words is "six hundred sixty-seven trillion, five hundred forty-two billion, two hundred thirty-seven million, two hundred thirty-six thousand, five hundred thirty-one".