64155368773 has 2 divisors, whose sum is σ = 64155368774. Its totient is φ = 64155368772.

The previous prime is 64155368759. The next prime is 64155368831. The reversal of 64155368773 is 37786355146.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 59437464804 + 4717903969 = 243798^2 + 68687^2 .

It is a cyclic number.

It is not a de Polignac number, because 64155368773 - 2⁹ = 64155368261 is a prime.

It is a super-2 number, since 2×64155368773² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (64155368743) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32077684386 + 32077684387.

It is an arithmetic number, because the mean of its divisors is an integer number (32077684387).

Almost surely, 2^64155368773 is an apocalyptic number.

It is an amenable number.

64155368773 is a deficient number, since it is larger than the sum of its proper divisors (1).

64155368773 is an equidigital number, since it uses as much as digits as its factorization.

64155368773 is an evil number, because the sum of its binary digits is even.

The product of its digits is 12700800, while the sum is 55.

The spelling of 64155368773 in words is "sixty-four billion, one hundred fifty-five million, three hundred sixty-eight thousand, seven hundred seventy-three".