1662820001 has 2 divisors, whose sum is σ = 1662820002. Its totient is φ = 1662820000.

The previous prime is 1662819971. The next prime is 1662820021. The reversal of 1662820001 is 1000282661.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1661377600 + 1442401 = 40760^2 + 1201^2 .

It is a cyclic number.

It is not a de Polignac number, because 1662820001 - 2¹⁴ = 1662803617 is a prime.

It is not a weakly prime, because it can be changed into another prime (1662820021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 831410000 + 831410001.

It is an arithmetic number, because the mean of its divisors is an integer number (831410001).

Almost surely, 2^1662820001 is an apocalyptic number.

It is an amenable number.

1662820001 is a deficient number, since it is larger than the sum of its proper divisors (1).

1662820001 is an equidigital number, since it uses as much as digits as its factorization.

1662820001 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1152, while the sum is 26.

The square root of 1662820001 is about 40777.6899909742. The cubic root of 1662820001 is about 1184.7182535616.

The spelling of 1662820001 in words is "one billion, six hundred sixty-two million, eight hundred twenty thousand, one".