3618874647557 has 24 divisors (see below), whose sum is σ = 3978549193608. Its totient is φ = 3289592217600.

The previous prime is 3618874647541. The next prime is 3618874647599. The reversal of 3618874647557 is 7557464788163.

It is a Cunningham number, because it is equal to 1902334²+1.

It can be written as a sum of positive squares in 12 ways, for example, as 1794297756196 + 1824576891361 = 1339514^2 + 1350769^2 .

It is not a de Polignac number, because 3618874647557 - 2⁴ = 3618874647541 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3618874047557) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 7679207 + ... + 8136827.

It is an arithmetic number, because the mean of its divisors is an integer number (165772883067).

Almost surely, 2^{3618874647557} is an apocalyptic number.

It is an amenable number.

3618874647557 is a deficient number, since it is larger than the sum of its proper divisors (359674546051).

3618874647557 is a wasteful number, since it uses less digits than its factorization.

3618874647557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 458361 (or 458348 counting only the distinct ones).

The product of its digits is 948326400, while the sum is 71.

The spelling of 3618874647557 in words is "three trillion, six hundred eighteen billion, eight hundred seventy-four million, six hundred forty-seven thousand, five hundred fifty-seven".