64235772961 has 2 divisors, whose sum is σ = 64235772962. Its totient is φ = 64235772960.

The previous prime is 64235772959. The next prime is 64235773013. The reversal of 64235772961 is 16927753246.

It is a happy number.

It is an a-pointer prime, because the next prime (64235773013) can be obtained adding 64235772961 to its sum of digits (52).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 62116091361 + 2119681600 = 249231^2 + 46040^2 .

It is a cyclic number.

It is not a de Polignac number, because 64235772961 - 2¹ = 64235772959 is a prime.

It is a super-3 number, since 3×64235772961³ (a number of 33 digits) contains 333 as substring.

Together with 64235772959, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 64235772899 and 64235772908.

It is not a weakly prime, because it can be changed into another prime (64235772941) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32117886480 + 32117886481.

It is an arithmetic number, because the mean of its divisors is an integer number (32117886481).

Almost surely, 2^64235772961 is an apocalyptic number.

It is an amenable number.

64235772961 is a deficient number, since it is larger than the sum of its proper divisors (1).

64235772961 is an equidigital number, since it uses as much as digits as its factorization.

64235772961 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3810240, while the sum is 52.

The spelling of 64235772961 in words is "sixty-four billion, two hundred thirty-five million, seven hundred seventy-two thousand, nine hundred sixty-one".