669340051 has 2 divisors, whose sum is σ = 669340052. Its totient is φ = 669340050.

The previous prime is 669339989. The next prime is 669340079. The reversal of 669340051 is 150043966.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 669340051 - 2¹⁵ = 669307283 is a prime.

It is a super-2 number, since 2×669340051² = 896032207745365202, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 669339989 and 669340016.

It is not a weakly prime, because it can be changed into another prime (669340951) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 334670025 + 334670026.

It is an arithmetic number, because the mean of its divisors is an integer number (334670026).

Almost surely, 2^669340051 is an apocalyptic number.

669340051 is a deficient number, since it is larger than the sum of its proper divisors (1).

669340051 is an equidigital number, since it uses as much as digits as its factorization.

669340051 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 19440, while the sum is 34.

The square root of 669340051 is about 25871.6070432434. The cubic root of 669340051 is about 874.7466155022.

The spelling of 669340051 in words is "six hundred sixty-nine million, three hundred forty thousand, fifty-one".