620117186989 has 2 divisors, whose sum is σ = 620117186990. Its totient is φ = 620117186988.

The previous prime is 620117186987. The next prime is 620117186993. The reversal of 620117186989 is 989681711026.

620117186989 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 620116875625 + 311364 = 787475^2 + 558^2 .

It is a cyclic number.

It is not a de Polignac number, because 620117186989 - 2¹ = 620117186987 is a prime.

It is a super-2 number, since 2×620117186989² (a number of 24 digits) contains 22 as substring.

Together with 620117186987, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (620117186981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 310058593494 + 310058593495.

It is an arithmetic number, because the mean of its divisors is an integer number (310058593495).

Almost surely, 2^620117186989 is an apocalyptic number.

It is an amenable number.

620117186989 is a deficient number, since it is larger than the sum of its proper divisors (1).

620117186989 is an equidigital number, since it uses as much as digits as its factorization.

620117186989 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2612736, while the sum is 58.

The spelling of 620117186989 in words is "six hundred twenty billion, one hundred seventeen million, one hundred eighty-six thousand, nine hundred eighty-nine".