3657671561 has 2 divisors, whose sum is σ = 3657671562. Its totient is φ = 3657671560.

The previous prime is 3657671539. The next prime is 3657671573. The reversal of 3657671561 is 1651767563.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3535015936 + 122655625 = 59456^2 + 11075^2 .

It is a cyclic number.

It is not a de Polignac number, because 3657671561 - 2²² = 3653477257 is a prime.

It is a super-2 number, since 2×3657671561² = 26757122496296353442, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (3657671581) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1828835780 + 1828835781.

It is an arithmetic number, because the mean of its divisors is an integer number (1828835781).

Almost surely, 2^3657671561 is an apocalyptic number.

It is an amenable number.

3657671561 is a deficient number, since it is larger than the sum of its proper divisors (1).

3657671561 is an equidigital number, since it uses as much as digits as its factorization.

3657671561 is an evil number, because the sum of its binary digits is even.

The product of its digits is 793800, while the sum is 47.

The square root of 3657671561 is about 60478.6868326355. The cubic root of 3657671561 is about 1540.7596691927.

The spelling of 3657671561 in words is "three billion, six hundred fifty-seven million, six hundred seventy-one thousand, five hundred sixty-one".