64470772321 has 2 divisors, whose sum is σ = 64470772322. Its totient is φ = 64470772320.

The previous prime is 64470772277. The next prime is 64470772339. The reversal of 64470772321 is 12327707446.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 62220313600 + 2250458721 = 249440^2 + 47439^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-64470772321 is a prime.

It is not a weakly prime, because it can be changed into another prime (64470772021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32235386160 + 32235386161.

It is an arithmetic number, because the mean of its divisors is an integer number (32235386161).

Almost surely, 2^64470772321 is an apocalyptic number.

It is an amenable number.

64470772321 is a deficient number, since it is larger than the sum of its proper divisors (1).

64470772321 is an equidigital number, since it uses as much as digits as its factorization.

64470772321 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 395136, while the sum is 43.

The spelling of 64470772321 in words is "sixty-four billion, four hundred seventy million, seven hundred seventy-two thousand, three hundred twenty-one".