253621666 has 8 divisors (see below), whose sum is σ = 386110800. Its totient is φ = 124918068.

The previous prime is 253621663. The next prime is 253621681. The reversal of 253621666 is 666126352.

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

It is not an unprimeable number, because it can be changed into a prime (253621663) 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 3 ways as a sum of consecutive naturals, for example, 946216 + ... + 946483.

It is an arithmetic number, because the mean of its divisors is an integer number (48263850).

Almost surely, 2^253621666 is an apocalyptic number.

253621666 is a deficient number, since it is larger than the sum of its proper divisors (132489134).

253621666 is a wasteful number, since it uses less digits than its factorization.

253621666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1892768.

The product of its digits is 77760, while the sum is 37.

The square root of 253621666 is about 15925.5036341084. The cubic root of 253621666 is about 632.9879613406.

It can be divided in two parts, 25362 and 1666, that added together give a triangular number (27028 = T₂₃₂).

The spelling of 253621666 in words is "two hundred fifty-three million, six hundred twenty-one thousand, six hundred sixty-six".