620236661 has 16 divisors (see below), whose sum is σ = 700273728. Its totient is φ = 544377600.

The previous prime is 620236651. The next prime is 620236681. The reversal of 620236661 is 166632026.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-620236661 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (620236651) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 47501 + ... + 59133.

It is an arithmetic number, because the mean of its divisors is an integer number (43767108).

Almost surely, 2^620236661 is an apocalyptic number.

It is an amenable number.

620236661 is a deficient number, since it is larger than the sum of its proper divisors (80037067).

620236661 is a wasteful number, since it uses less digits than its factorization.

620236661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11812.

The product of its (nonzero) digits is 15552, while the sum is 32.

The square root of 620236661 is about 24904.5510098054. The cubic root of 620236661 is about 852.8103798404.

Adding to 620236661 its reverse (166632026), we get a palindrome (786868687).

The spelling of 620236661 in words is "six hundred twenty million, two hundred thirty-six thousand, six hundred sixty-one".