77243627647231 has 2 divisors, whose sum is σ = 77243627647232. Its totient is φ = 77243627647230.

The previous prime is 77243627647201. The next prime is 77243627647301. The reversal of 77243627647231 is 13274672634277.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 77243627647231 - 2¹¹ = 77243627645183 is a prime.

It is a super-2 number, since 2×77243627647231² (a number of 29 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 77243627647231.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (77243627647201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38621813823615 + 38621813823616.

It is an arithmetic number, because the mean of its divisors is an integer number (38621813823616).

Almost surely, 2^{77243627647231} is an apocalyptic number.

77243627647231 is a deficient number, since it is larger than the sum of its proper divisors (1).

77243627647231 is an equidigital number, since it uses as much as digits as its factorization.

77243627647231 is an evil number, because the sum of its binary digits is even.

The product of its digits is 99574272, while the sum is 61.

The spelling of 77243627647231 in words is "seventy-seven trillion, two hundred forty-three billion, six hundred twenty-seven million, six hundred forty-seven thousand, two hundred thirty-one".