105215666 has 8 divisors (see below), whose sum is σ = 157939740. Its totient is φ = 52569088.

The previous prime is 105215651. The next prime is 105215689. The reversal of 105215666 is 666512501.

It can be written as a sum of positive squares in 2 ways, for example, as 98585041 + 6630625 = 9929^2 + 2575^2 .

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

It is a super-2 number, since 2×105215666² = 22140672743647112, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15851 + ... + 21486.

Almost surely, 2^105215666 is an apocalyptic number.

105215666 is a deficient number, since it is larger than the sum of its proper divisors (52724074).

105215666 is a wasteful number, since it uses less digits than its factorization.

105215666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38748.

The product of its (nonzero) digits is 10800, while the sum is 32.

The square root of 105215666 is about 10257.4687910810. The cubic root of 105215666 is about 472.0921759317.

The spelling of 105215666 in words is "one hundred five million, two hundred fifteen thousand, six hundred sixty-six".