215120666 has 8 divisors (see below), whose sum is σ = 333808020. Its totient is φ = 103851328.

The previous prime is 215120657. The next prime is 215120677. The reversal of 215120666 is 666021512.

It can be written as a sum of positive squares in 2 ways, for example, as 214007641 + 1113025 = 14629^2 + 1055^2 .

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

It is a Harshad number since it is a multiple of its sum of digits (29).

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, 1854431 + ... + 1854546.

Almost surely, 2^215120666 is an apocalyptic number.

215120666 is a deficient number, since it is larger than the sum of its proper divisors (118687354).

215120666 is a wasteful number, since it uses less digits than its factorization.

215120666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3709008.

The product of its (nonzero) digits is 4320, while the sum is 29.

The square root of 215120666 is about 14666.9923978981. The cubic root of 215120666 is about 599.1846944818.

The spelling of 215120666 in words is "two hundred fifteen million, one hundred twenty thousand, six hundred sixty-six".