1620066101 has 2 divisors, whose sum is σ = 1620066102. Its totient is φ = 1620066100.

The previous prime is 1620066089. The next prime is 1620066113. The reversal of 1620066101 is 1016600261.

It is a balanced prime because it is at equal distance from previous prime (1620066089) and next prime (1620066113).

It can be written as a sum of positive squares in only one way, i.e., 1619982001 + 84100 = 40249^2 + 290^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1620066101 is a prime.

It is a super-2 number, since 2×1620066101² = 5249228343218684402, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1620066401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 810033050 + 810033051.

It is an arithmetic number, because the mean of its divisors is an integer number (810033051).

Almost surely, 2^1620066101 is an apocalyptic number.

It is an amenable number.

1620066101 is a deficient number, since it is larger than the sum of its proper divisors (1).

1620066101 is an equidigital number, since it uses as much as digits as its factorization.

1620066101 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 432, while the sum is 23.

The square root of 1620066101 is about 40250.0447328944. The cubic root of 1620066101 is about 1174.4762660017.

Adding to 1620066101 its reverse (1016600261), we get a palindrome (2636666362).

The spelling of 1620066101 in words is "one billion, six hundred twenty million, sixty-six thousand, one hundred one".