212663645 has 16 divisors (see below), whose sum is σ = 257983488. Its totient is φ = 168284160.

The previous prime is 212663621. The next prime is 212663669. The reversal of 212663645 is 546366212.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (212663621) and next prime (212663669).

It is not a de Polignac number, because 212663645 - 2¹⁰ = 212662621 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 214100 + ... + 215090.

It is an arithmetic number, because the mean of its divisors is an integer number (16123968).

Almost surely, 2^212663645 is an apocalyptic number.

It is an amenable number.

212663645 is a deficient number, since it is larger than the sum of its proper divisors (45319843).

212663645 is a wasteful number, since it uses less digits than its factorization.

212663645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1420.

The product of its digits is 51840, while the sum is 35.

The square root of 212663645 is about 14582.9916340921. The cubic root of 212663645 is about 596.8947390565.

The spelling of 212663645 in words is "two hundred twelve million, six hundred sixty-three thousand, six hundred forty-five".