3661655247 has 8 divisors (see below), whose sum is σ = 5424674480. Its totient is φ = 2441103480.

The previous prime is 3661655219. The next prime is 3661655287. The reversal of 3661655247 is 7425561663.

3661655247 is a `hidden beast` number, since 3 + 6 + 61 + 65 + 524 + 7 = 666.

3661655247 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 3661655247 - 2⁷ = 3661655119 is a prime.

It is a super-3 number, since 3×3661655247³ (a number of 30 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3661655287) 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, 67808404 + ... + 67808457.

It is an arithmetic number, because the mean of its divisors is an integer number (678084310).

Almost surely, 2^3661655247 is an apocalyptic number.

3661655247 is a deficient number, since it is larger than the sum of its proper divisors (1763019233).

3661655247 is a wasteful number, since it uses less digits than its factorization.

3661655247 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 135616870 (or 135616864 counting only the distinct ones).

The product of its digits is 907200, while the sum is 45.

The square root of 3661655247 is about 60511.6124971067. The cubic root of 3661655247 is about 1541.3188296349.

The spelling of 3661655247 in words is "three billion, six hundred sixty-one million, six hundred fifty-five thousand, two hundred forty-seven".