1649737669 has 2 divisors, whose sum is σ = 1649737670. Its totient is φ = 1649737668.

The previous prime is 1649737657. The next prime is 1649737679. The reversal of 1649737669 is 9667379461.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1298737444 + 351000225 = 36038^2 + 18735^2 .

It is a cyclic number.

It is not a de Polignac number, because 1649737669 - 2⁵ = 1649737637 is a prime.

It is a super-2 number, since 2×1649737669² = 5443268753035107122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1649737679) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 824868834 + 824868835.

It is an arithmetic number, because the mean of its divisors is an integer number (824868835).

Almost surely, 2^1649737669 is an apocalyptic number.

It is an amenable number.

1649737669 is a deficient number, since it is larger than the sum of its proper divisors (1).

1649737669 is an equidigital number, since it uses as much as digits as its factorization.

1649737669 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10287648, while the sum is 58.

The square root of 1649737669 is about 40616.9628234313. The cubic root of 1649737669 is about 1181.6031233993.

The spelling of 1649737669 in words is "one billion, six hundred forty-nine million, seven hundred thirty-seven thousand, six hundred sixty-nine".