36421666 has 4 divisors (see below), whose sum is σ = 54632502. Its totient is φ = 18210832.

The previous prime is 36421661. The next prime is 36421691. The reversal of 36421666 is 66612463.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 66612463 = 797 ⋅83579.

It can be written as a sum of positive squares in only one way, i.e., 36421225 + 441 = 6035^2 + 21^2 .

It is not an unprimeable number, because it can be changed into a prime (36421661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9105415 + ... + 9105418.

Almost surely, 2^36421666 is an apocalyptic number.

36421666 is a deficient number, since it is larger than the sum of its proper divisors (18210836).

36421666 is a wasteful number, since it uses less digits than its factorization.

36421666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18210835.

The product of its digits is 31104, while the sum is 34.

The square root of 36421666 is about 6035.0365367577. The cubic root of 36421666 is about 331.4769003861.

The spelling of 36421666 in words is "thirty-six million, four hundred twenty-one thousand, six hundred sixty-six".