64444442530 has 32 divisors (see below), whose sum is σ = 128299382064. Its totient is φ = 23151764736.

The previous prime is 64444442521. The next prime is 64444442539. The reversal of 64444442530 is 3524444446.

It is an interprime number because it is at equal distance from previous prime (64444442521) and next prime (64444442539).

It can be written as a sum of positive squares in 8 ways, for example, as 27972228001 + 36472214529 = 167249^2 + 190977^2 .

It is not an unprimeable number, because it can be changed into a prime (64444442539) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6694197 + ... + 6703816.

Almost surely, 2^64444442530 is an apocalyptic number.

64444442530 is a deficient number, since it is larger than the sum of its proper divisors (63854939534).

64444442530 is a wasteful number, since it uses less digits than its factorization.

64444442530 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13398070.

The product of its (nonzero) digits is 737280, while the sum is 40.

Adding to 64444442530 its reverse (3524444446), we get a palindrome (67968886976).

The spelling of 64444442530 in words is "sixty-four billion, four hundred forty-four million, four hundred forty-two thousand, five hundred thirty".