67542624538691 has 2 divisors, whose sum is σ = 67542624538692. Its totient is φ = 67542624538690.

The previous prime is 67542624538619. The next prime is 67542624538693. The reversal of 67542624538691 is 19683542624576.

Together with previous prime (67542624538619) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-67542624538691 is a prime.

It is a super-2 number, since 2×67542624538691² (a number of 28 digits) contains 22 as substring.

Together with 67542624538693, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (67542624538693) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33771312269345 + 33771312269346.

It is an arithmetic number, because the mean of its divisors is an integer number (33771312269346).

Almost surely, 2^{67542624538691} is an apocalyptic number.

67542624538691 is a deficient number, since it is larger than the sum of its proper divisors (1).

67542624538691 is an equidigital number, since it uses as much as digits as its factorization.

67542624538691 is an evil number, because the sum of its binary digits is even.

The product of its digits is 522547200, while the sum is 68.

The spelling of 67542624538691 in words is "sixty-seven trillion, five hundred forty-two billion, six hundred twenty-four million, five hundred thirty-eight thousand, six hundred ninety-one".