673126635491 has 2 divisors, whose sum is σ = 673126635492. Its totient is φ = 673126635490.

The previous prime is 673126635487. The next prime is 673126635607. The reversal of 673126635491 is 194536621376.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 673126635491 - 2² = 673126635487 is a prime.

It is a super-2 number, since 2×673126635491² (a number of 24 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (673126635431) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 336563317745 + 336563317746.

It is an arithmetic number, because the mean of its divisors is an integer number (336563317746).

Almost surely, 2^673126635491 is an apocalyptic number.

673126635491 is a deficient number, since it is larger than the sum of its proper divisors (1).

673126635491 is an equidigital number, since it uses as much as digits as its factorization.

673126635491 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4898880, while the sum is 53.

The spelling of 673126635491 in words is "six hundred seventy-three billion, one hundred twenty-six million, six hundred thirty-five thousand, four hundred ninety-one".