3661725078 has 48 divisors (see below), whose sum is σ = 8953448400. Its totient is φ = 1071349440.

The previous prime is 3661725059. The next prime is 3661725079. The reversal of 3661725078 is 8705271663.

3661725078 is a `hidden beast` number, since 3 + 6 + 617 + 25 + 0 + 7 + 8 = 666.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3661725079) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 313113 + ... + 324596.

It is an arithmetic number, because the mean of its divisors is an integer number (186530175).

Almost surely, 2^3661725078 is an apocalyptic number.

3661725078 is an abundant number, since it is smaller than the sum of its proper divisors (5291723322).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

3661725078 is a wasteful number, since it uses less digits than its factorization.

3661725078 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 637757 (or 637754 counting only the distinct ones).

The product of its (nonzero) digits is 423360, while the sum is 45.

The square root of 3661725078 is about 60512.1894993067. The cubic root of 3661725078 is about 1541.3286276765.

The spelling of 3661725078 in words is "three billion, six hundred sixty-one million, seven hundred twenty-five thousand, seventy-eight".