64145245623 has 4 divisors (see below), whose sum is σ = 85526994168. Its totient is φ = 42763497080.

The previous prime is 64145245613. The next prime is 64145245649. The reversal of 64145245623 is 32654254146.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 64145245623 - 2⁴ = 64145245607 is a prime.

It is a super-2 number, since 2×64145245623² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64145245613) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10690874268 + ... + 10690874273.

It is an arithmetic number, because the mean of its divisors is an integer number (21381748542).

Almost surely, 2^64145245623 is an apocalyptic number.

64145245623 is a deficient number, since it is larger than the sum of its proper divisors (21381748545).

64145245623 is a wasteful number, since it uses less digits than its factorization.

64145245623 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21381748544.

The product of its digits is 691200, while the sum is 42.

Adding to 64145245623 its reverse (32654254146), we get a palindrome (96799499769).

The spelling of 64145245623 in words is "sixty-four billion, one hundred forty-five million, two hundred forty-five thousand, six hundred twenty-three".