3715842388561 has 4 divisors (see below), whose sum is σ = 3934421352612. Its totient is φ = 3497263424512.

The previous prime is 3715842388549. The next prime is 3715842388619. The reversal of 3715842388561 is 1658832485173.

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 1369967247936 + 2345875140625 = 1170456^2 + 1531625^2 .

It is a cyclic number.

It is not a de Polignac number, because 3715842388561 - 2⁵ = 3715842388529 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 3715842388561.

It is not an unprimeable number, because it can be changed into a prime (3715842386561) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 109289482000 + ... + 109289482033.

It is an arithmetic number, because the mean of its divisors is an integer number (983605338153).

Almost surely, 2^{3715842388561} is an apocalyptic number.

It is an amenable number.

3715842388561 is a deficient number, since it is larger than the sum of its proper divisors (218578964051).

3715842388561 is a wasteful number, since it uses less digits than its factorization.

3715842388561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 218578964050.

The product of its digits is 38707200, while the sum is 61.

The spelling of 3715842388561 in words is "three trillion, seven hundred fifteen billion, eight hundred forty-two million, three hundred eighty-eight thousand, five hundred sixty-one".