64138937250445 has 8 divisors (see below), whose sum is σ = 76976606211480. Its totient is φ = 51304562126400.

The previous prime is 64138937250439. The next prime is 64138937250463. The reversal of 64138937250445 is 54405273983146.

It can be written as a sum of positive squares in 4 ways, for example, as 20713394132809 + 43425543117636 = 4551197^2 + 6589806^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 64138937250445 - 2²⁵ = 64138903696013 is a prime.

It is a super-2 number, since 2×64138937250445² (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 7 ways as a sum of consecutive naturals, for example, 823416406 + ... + 823494295.

It is an arithmetic number, because the mean of its divisors is an integer number (9622075776435).

It is a 1-persistent number, because it is pandigital, but 2⋅64138937250445 = 128277874500890 is not.

Almost surely, 2^{64138937250445} is an apocalyptic number.

It is an amenable number.

64138937250445 is a deficient number, since it is larger than the sum of its proper divisors (12837668961035).

64138937250445 is a wasteful number, since it uses less digits than its factorization.

64138937250445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1646918495.

The product of its (nonzero) digits is 87091200, while the sum is 61.

The spelling of 64138937250445 in words is "sixty-four trillion, one hundred thirty-eight billion, nine hundred thirty-seven million, two hundred fifty thousand, four hundred forty-five".