620106145961 has 2 divisors, whose sum is σ = 620106145962. Its totient is φ = 620106145960.

The previous prime is 620106145913. The next prime is 620106145991. The reversal of 620106145961 is 169541601026.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 423618739600 + 196487406361 = 650860^2 + 443269^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-620106145961 is a prime.

It is a super-2 number, since 2×620106145961² (a number of 24 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (620106145991) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 310053072980 + 310053072981.

It is an arithmetic number, because the mean of its divisors is an integer number (310053072981).

Almost surely, 2^620106145961 is an apocalyptic number.

It is an amenable number.

620106145961 is a deficient number, since it is larger than the sum of its proper divisors (1).

620106145961 is an equidigital number, since it uses as much as digits as its factorization.

620106145961 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 77760, while the sum is 41.

Adding to 620106145961 its reverse (169541601026), we get a palindrome (789647746987).

The spelling of 620106145961 in words is "six hundred twenty billion, one hundred six million, one hundred forty-five thousand, nine hundred sixty-one".