91672666543 has 2 divisors, whose sum is σ = 91672666544. Its totient is φ = 91672666542.

The previous prime is 91672666523. The next prime is 91672666621. The reversal of 91672666543 is 34566627619.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 91672666543 - 2²¹ = 91670569391 is a prime.

It is a super-2 number, since 2×91672666543² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91672666523) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45836333271 + 45836333272.

It is an arithmetic number, because the mean of its divisors is an integer number (45836333272).

Almost surely, 2^91672666543 is an apocalyptic number.

91672666543 is a deficient number, since it is larger than the sum of its proper divisors (1).

91672666543 is an equidigital number, since it uses as much as digits as its factorization.

91672666543 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9797760, while the sum is 55.

The spelling of 91672666543 in words is "ninety-one billion, six hundred seventy-two million, six hundred sixty-six thousand, five hundred forty-three".