1665650047 has 2 divisors, whose sum is σ = 1665650048. Its totient is φ = 1665650046.

The previous prime is 1665650017. The next prime is 1665650093. The reversal of 1665650047 is 7400565661.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1665650047 - 2¹¹ = 1665647999 is a prime.

It is a super-2 number, since 2×1665650047² = 5548780158142204418, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1665649991 and 1665650009.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1665650017) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 832825023 + 832825024.

It is an arithmetic number, because the mean of its divisors is an integer number (832825024).

Almost surely, 2^1665650047 is an apocalyptic number.

1665650047 is a deficient number, since it is larger than the sum of its proper divisors (1).

1665650047 is an equidigital number, since it uses as much as digits as its factorization.

1665650047 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 151200, while the sum is 40.

The square root of 1665650047 is about 40812.3761498887. The cubic root of 1665650047 is about 1185.3899852863.

The spelling of 1665650047 in words is "one billion, six hundred sixty-five million, six hundred fifty thousand, forty-seven".