64408348945 has 4 divisors (see below), whose sum is σ = 77290018740. Its totient is φ = 51526679152.

The previous prime is 64408348933. The next prime is 64408348973. The reversal of 64408348945 is 54984380446.

It is a Cunningham number, because it is equal to 253788²+1.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 23186761984 + 41221586961 = 152272^2 + 203031^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-64408348945 is a prime.

It is a super-2 number, since 2×64408348945² (a number of 22 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6440834890 + ... + 6440834899.

It is an arithmetic number, because the mean of its divisors is an integer number (19322504685).

Almost surely, 2^64408348945 is an apocalyptic number.

It is an amenable number.

64408348945 is a deficient number, since it is larger than the sum of its proper divisors (12881669795).

64408348945 is a wasteful number, since it uses less digits than its factorization.

64408348945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12881669794.

The product of its (nonzero) digits is 13271040, while the sum is 55.

The spelling of 64408348945 in words is "sixty-four billion, four hundred eight million, three hundred forty-eight thousand, nine hundred forty-five".