8137421765 has 8 divisors (see below), whose sum is σ = 10652624928. Its totient is φ = 5918124880.

The previous prime is 8137421759. The next prime is 8137421791. The reversal of 8137421765 is 5671247318.

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

It is not a de Polignac number, because 8137421765 - 2¹² = 8137417669 is a prime.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 73976507 + ... + 73976616.

It is an arithmetic number, because the mean of its divisors is an integer number (1331578116).

Almost surely, 2^8137421765 is an apocalyptic number.

It is an amenable number.

8137421765 is a deficient number, since it is larger than the sum of its proper divisors (2515203163).

8137421765 is a wasteful number, since it uses less digits than its factorization.

8137421765 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 147953139.

The product of its digits is 282240, while the sum is 44.

The square root of 8137421765 is about 90207.6591260410. The cubic root of 8137421765 is about 2011.3868604193.

The spelling of 8137421765 in words is "eight billion, one hundred thirty-seven million, four hundred twenty-one thousand, seven hundred sixty-five".