620665111 has 4 divisors (see below), whose sum is σ = 677089224. Its totient is φ = 564241000.

The previous prime is 620665103. The next prime is 620665141. The reversal of 620665111 is 111566026.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 620665111 - 2³ = 620665103 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 620665111.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (620665141) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 28212040 + ... + 28212061.

It is an arithmetic number, because the mean of its divisors is an integer number (169272306).

Almost surely, 2^620665111 is an apocalyptic number.

620665111 is the 11142-nd centered decagonal number.

620665111 is a deficient number, since it is larger than the sum of its proper divisors (56424113).

620665111 is a wasteful number, since it uses less digits than its factorization.

620665111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56424112.

The product of its (nonzero) digits is 2160, while the sum is 28.

The square root of 620665111 is about 24913.1513662965. The cubic root of 620665111 is about 853.0067040975.

It can be divided in two parts, 6206 and 65111, that added together give a palindrome (71317).

The spelling of 620665111 in words is "six hundred twenty million, six hundred sixty-five thousand, one hundred eleven".