3874126801865 has 4 divisors (see below), whose sum is σ = 4648952162244. Its totient is φ = 3099301441488.

The previous prime is 3874126801819. The next prime is 3874126801871. The reversal of 3874126801865 is 5681086214783.

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

It can be written as a sum of positive squares in 2 ways, for example, as 2725731658441 + 1148395143424 = 1650979^2 + 1071632^2 .

It is a cyclic number.

It is not a de Polignac number, because 3874126801865 - 2¹² = 3874126797769 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 387412680182 + ... + 387412680191.

It is an arithmetic number, because the mean of its divisors is an integer number (1162238040561).

Almost surely, 2^{3874126801865} is an apocalyptic number.

It is an amenable number.

3874126801865 is a deficient number, since it is larger than the sum of its proper divisors (774825360379).

3874126801865 is an equidigital number, since it uses as much as digits as its factorization.

3874126801865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 774825360378.

The product of its (nonzero) digits is 15482880, while the sum is 59.

The spelling of 3874126801865 in words is "three trillion, eight hundred seventy-four billion, one hundred twenty-six million, eight hundred one thousand, eight hundred sixty-five".