3661538257 has 8 divisors (see below), whose sum is σ = 3944856384. Its totient is φ = 3378457488.

The previous prime is 3661538239. The next prime is 3661538263. The reversal of 3661538257 is 7528351663.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 3661538257 - 2¹⁵ = 3661505489 is a prime.

It is a super-3 number, since 3×3661538257³ (a number of 30 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3661538227) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 26623 + ... + 89620.

It is an arithmetic number, because the mean of its divisors is an integer number (493107048).

Almost surely, 2^3661538257 is an apocalyptic number.

It is an amenable number.

3661538257 is a deficient number, since it is larger than the sum of its proper divisors (283318127).

3661538257 is a wasteful number, since it uses less digits than its factorization.

3661538257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 118679.

The product of its digits is 907200, while the sum is 46.

The square root of 3661538257 is about 60510.6458154266. The cubic root of 3661538257 is about 1541.3024143984.

The spelling of 3661538257 in words is "three billion, six hundred sixty-one million, five hundred thirty-eight thousand, two hundred fifty-seven".