64146721337 has 2 divisors, whose sum is σ = 64146721338. Its totient is φ = 64146721336.

The previous prime is 64146721321. The next prime is 64146721433. The reversal of 64146721337 is 73312764146.

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., 51975336361 + 12171384976 = 227981^2 + 110324^2 .

It is a cyclic number.

It is not a de Polignac number, because 64146721337 - 2⁴ = 64146721321 is a prime.

It is a super-2 number, since 2×64146721337² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (64146723337) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32073360668 + 32073360669.

It is an arithmetic number, because the mean of its divisors is an integer number (32073360669).

Almost surely, 2^64146721337 is an apocalyptic number.

It is an amenable number.

64146721337 is a deficient number, since it is larger than the sum of its proper divisors (1).

64146721337 is an equidigital number, since it uses as much as digits as its factorization.

64146721337 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 508032, while the sum is 44.

The spelling of 64146721337 in words is "sixty-four billion, one hundred forty-six million, seven hundred twenty-one thousand, three hundred thirty-seven".