64237844765 has 16 divisors (see below), whose sum is σ = 77939999280. Its totient is φ = 50821747200.

The previous prime is 64237844747. The next prime is 64237844773. The reversal of 64237844765 is 56744873246.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 5391818041 + 58846026724 = 73429^2 + 242582^2 .

It is not a de Polignac number, because 64237844765 - 2¹⁴ = 64237828381 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 64237844765.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 358571 + ... + 506999.

It is an arithmetic number, because the mean of its divisors is an integer number (4871249955).

Almost surely, 2^64237844765 is an apocalyptic number.

It is an amenable number.

64237844765 is a deficient number, since it is larger than the sum of its proper divisors (13702154515).

64237844765 is a wasteful number, since it uses less digits than its factorization.

64237844765 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 149392.

The product of its digits is 27095040, while the sum is 56.

The spelling of 64237844765 in words is "sixty-four billion, two hundred thirty-seven million, eight hundred forty-four thousand, seven hundred sixty-five".