64612744645 has 16 divisors (see below), whose sum is σ = 82909037808. Its totient is φ = 48167910400.

The previous prime is 64612744627. The next prime is 64612744657. The reversal of 64612744645 is 54644721646.

It can be written as a sum of positive squares in 8 ways, for example, as 14972459044 + 49640285601 = 122362^2 + 222801^2 .

It is a de Polignac number, because none of the positive numbers 2^k-64612744645 is a prime.

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, 3754534 + ... + 3771703.

It is an arithmetic number, because the mean of its divisors is an integer number (5181814863).

Almost surely, 2^64612744645 is an apocalyptic number.

It is an amenable number.

64612744645 is a deficient number, since it is larger than the sum of its proper divisors (18296293163).

64612744645 is a wasteful number, since it uses less digits than its factorization.

64612744645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7526360.

The product of its digits is 3870720, while the sum is 49.

The spelling of 64612744645 in words is "sixty-four billion, six hundred twelve million, seven hundred forty-four thousand, six hundred forty-five".