64626545645 has 16 divisors (see below), whose sum is σ = 77712756912. Its totient is φ = 51594048000.

The previous prime is 64626545639. The next prime is 64626545671. The reversal of 64626545645 is 54654562646.

It can be written as a sum of positive squares in 8 ways, for example, as 4282131844 + 60344413801 = 65438^2 + 245651^2 .

It is not a de Polignac number, because 64626545645 - 2¹⁰ = 64626544621 is a prime.

It is a super-3 number, since 3×64626545645³ (a number of 33 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

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 15 ways as a sum of consecutive naturals, for example, 11745395 + ... + 11750895.

It is an arithmetic number, because the mean of its divisors is an integer number (4857047307).

Almost surely, 2^64626545645 is an apocalyptic number.

It is an amenable number.

64626545645 is a deficient number, since it is larger than the sum of its proper divisors (13086211267).

64626545645 is a wasteful number, since it uses less digits than its factorization.

64626545645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9952.

The product of its digits is 20736000, while the sum is 53.

The spelling of 64626545645 in words is "sixty-four billion, six hundred twenty-six million, five hundred forty-five thousand, six hundred forty-five".