245566621 has 4 divisors (see below), whose sum is σ = 258491200. Its totient is φ = 232642044.

The previous prime is 245566613. The next prime is 245566661. The reversal of 245566621 is 126665542.

245566621 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 245566621 - 2³ = 245566613 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (245566661) 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, 6462261 + ... + 6462298.

It is an arithmetic number, because the mean of its divisors is an integer number (64622800).

Almost surely, 2^245566621 is an apocalyptic number.

It is an amenable number.

245566621 is a deficient number, since it is larger than the sum of its proper divisors (12924579).

245566621 is a wasteful number, since it uses less digits than its factorization.

245566621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12924578.

The product of its digits is 86400, while the sum is 37.

The square root of 245566621 is about 15670.5654333212. The cubic root of 245566621 is about 626.2144884200.

The spelling of 245566621 in words is "two hundred forty-five million, five hundred sixty-six thousand, six hundred twenty-one".