64181138243 has 8 divisors (see below), whose sum is σ = 65337795600. Its totient is φ = 63034583040.

The previous prime is 64181138239. The next prime is 64181138249. The reversal of 64181138243 is 34283118146.

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

It is a cyclic number.

It is not a de Polignac number, because 64181138243 - 2² = 64181138239 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 64181138243.

It is not an unprimeable number, because it can be changed into a prime (64181138249) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2512718 + ... + 2538131.

It is an arithmetic number, because the mean of its divisors is an integer number (8167224450).

Almost surely, 2^64181138243 is an apocalyptic number.

64181138243 is a deficient number, since it is larger than the sum of its proper divisors (1156657357).

64181138243 is a wasteful number, since it uses less digits than its factorization.

64181138243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5051077.

The product of its digits is 110592, while the sum is 41.

The spelling of 64181138243 in words is "sixty-four billion, one hundred eighty-one million, one hundred thirty-eight thousand, two hundred forty-three".