64908625243645 has 4 divisors (see below), whose sum is σ = 77890350292380. Its totient is φ = 51926900194912.

The previous prime is 64908625243519. The next prime is 64908625243711. The reversal of 64908625243645 is 54634252680946.

It is a happy number.

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 50455649129796 + 14452976113849 = 7103214^2 + 3801707^2 .

It is a cyclic number.

It is not a de Polignac number, because 64908625243645 - 2²⁵ = 64908591689213 is a prime.

It is a super-2 number, since 2×64908625243645² (a number of 28 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6490862524360 + ... + 6490862524369.

It is an arithmetic number, because the mean of its divisors is an integer number (19472587573095).

Almost surely, 2^{64908625243645} is an apocalyptic number.

It is an amenable number.

64908625243645 is a deficient number, since it is larger than the sum of its proper divisors (12981725048735).

64908625243645 is a wasteful number, since it uses less digits than its factorization.

64908625243645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12981725048734.

The product of its (nonzero) digits is 298598400, while the sum is 64.

The spelling of 64908625243645 in words is "sixty-four trillion, nine hundred eight billion, six hundred twenty-five million, two hundred forty-three thousand, six hundred forty-five".