3871615423645 has 4 divisors (see below), whose sum is σ = 4645938508380. Its totient is φ = 3097292338912.

The previous prime is 3871615423589. The next prime is 3871615423673. The reversal of 3871615423645 is 5463245161783.

It is a happy number.

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 1305358805529 + 2566256618116 = 1142523^2 + 1601954^2 .

It is a cyclic number.

It is not a de Polignac number, because 3871615423645 - 2⁹ = 3871615423133 is a prime.

It is a congruent 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, 387161542360 + ... + 387161542369.

It is an arithmetic number, because the mean of its divisors is an integer number (1161484627095).

Almost surely, 2^{3871615423645} is an apocalyptic number.

It is an amenable number.

3871615423645 is a deficient number, since it is larger than the sum of its proper divisors (774323084735).

3871615423645 is an equidigital number, since it uses as much as digits as its factorization.

3871615423645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 774323084734.

The product of its digits is 14515200, while the sum is 55.

The spelling of 3871615423645 in words is "three trillion, eight hundred seventy-one billion, six hundred fifteen million, four hundred twenty-three thousand, six hundred forty-five".