215046661 has 4 divisors (see below), whose sum is σ = 215163712. Its totient is φ = 214929612.

The previous prime is 215046653. The next prime is 215046677. The reversal of 215046661 is 166640512.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 215046661 - 2³ = 215046653 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (215046631) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 55725 + ... + 59458.

It is an arithmetic number, because the mean of its divisors is an integer number (53790928).

Almost surely, 2^215046661 is an apocalyptic number.

It is an amenable number.

215046661 is a deficient number, since it is larger than the sum of its proper divisors (117051).

215046661 is a wasteful number, since it uses less digits than its factorization.

215046661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 117050.

The product of its (nonzero) digits is 8640, while the sum is 31.

The square root of 215046661 is about 14664.4693391885. The cubic root of 215046661 is about 599.1159768485.

The spelling of 215046661 in words is "two hundred fifteen million, forty-six thousand, six hundred sixty-one".