43213261646 has 4 divisors (see below), whose sum is σ = 64819892472. Its totient is φ = 21606630822.

The previous prime is 43213261643. The next prime is 43213261661. The reversal of 43213261646 is 64616231234.

43213261646 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (43213261643) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10803315410 + ... + 10803315413.

It is an arithmetic number, because the mean of its divisors is an integer number (16204973118).

Almost surely, 2^43213261646 is an apocalyptic number.

43213261646 is a deficient number, since it is larger than the sum of its proper divisors (21606630826).

43213261646 is a wasteful number, since it uses less digits than its factorization.

43213261646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21606630825.

The product of its digits is 124416, while the sum is 38.

The spelling of 43213261646 in words is "forty-three billion, two hundred thirteen million, two hundred sixty-one thousand, six hundred forty-six".