3661229986 has 4 divisors (see below), whose sum is σ = 5491844982. Its totient is φ = 1830614992.

The previous prime is 3661229981. The next prime is 3661229987. The reversal of 3661229986 is 6899221663.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 6899221663 = 211 ⋅32697733.

It can be written as a sum of positive squares in only one way, i.e., 2453319961 + 1207910025 = 49531^2 + 34755^2 .

It is not an unprimeable number, because it can be changed into a prime (3661229981) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 915307495 + ... + 915307498.

Almost surely, 2^3661229986 is an apocalyptic number.

3661229986 is a deficient number, since it is larger than the sum of its proper divisors (1830614996).

3661229986 is a wasteful number, since it uses less digits than its factorization.

3661229986 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1830614995.

The product of its digits is 1679616, while the sum is 52.

The square root of 3661229986 is about 60508.0985158185. The cubic root of 3661229986 is about 1541.2591582460.

The spelling of 3661229986 in words is "three billion, six hundred sixty-one million, two hundred twenty-nine thousand, nine hundred eighty-six".