64642446243 has 24 divisors (see below), whose sum is σ = 97449319968. Its totient is φ = 41213981952.

The previous prime is 64642446233. The next prime is 64642446287. The reversal of 64642446243 is 34264424646.

It is not a de Polignac number, because 64642446243 - 2¹⁶ = 64642380707 is a prime.

It is not an unprimeable number, because it can be changed into a prime (64642446223) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1299771 + ... + 1348587.

It is an arithmetic number, because the mean of its divisors is an integer number (4060388332).

Almost surely, 2^64642446243 is an apocalyptic number.

64642446243 is a deficient number, since it is larger than the sum of its proper divisors (32806873725).

64642446243 is a wasteful number, since it uses less digits than its factorization.

64642446243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55243 (or 55240 counting only the distinct ones).

The product of its digits is 2654208, while the sum is 45.

The spelling of 64642446243 in words is "sixty-four billion, six hundred forty-two million, four hundred forty-six thousand, two hundred forty-three".