1620226669 has 2 divisors, whose sum is σ = 1620226670. Its totient is φ = 1620226668.

The previous prime is 1620226631. The next prime is 1620226703. The reversal of 1620226669 is 9666220261.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1551966025 + 68260644 = 39395^2 + 8262^2 .

It is a cyclic number.

It is not a de Polignac number, because 1620226669 - 2²³ = 1611838061 is a prime.

It is a super-2 number, since 2×1620226669² = 5250268917877671122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1620226609) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 810113334 + 810113335.

It is an arithmetic number, because the mean of its divisors is an integer number (810113335).

Almost surely, 2^1620226669 is an apocalyptic number.

It is an amenable number.

1620226669 is a deficient number, since it is larger than the sum of its proper divisors (1).

1620226669 is an equidigital number, since it uses as much as digits as its factorization.

1620226669 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 93312, while the sum is 40.

The square root of 1620226669 is about 40252.0393147975. The cubic root of 1620226669 is about 1174.5150662858.

The spelling of 1620226669 in words is "one billion, six hundred twenty million, two hundred twenty-six thousand, six hundred sixty-nine".