47665561 has 2 divisors, whose sum is σ = 47665562. Its totient is φ = 47665560.

The previous prime is 47665559. The next prime is 47665577. The reversal of 47665561 is 16556674.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 35105625 + 12559936 = 5925^2 + 3544^2 .

It is a cyclic number.

It is not a de Polignac number, because 47665561 - 2¹ = 47665559 is a prime.

Together with 47665559, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (47645561) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 23832780 + 23832781.

It is an arithmetic number, because the mean of its divisors is an integer number (23832781).

Almost surely, 2^47665561 is an apocalyptic number.

It is an amenable number.

47665561 is a deficient number, since it is larger than the sum of its proper divisors (1).

47665561 is an equidigital number, since it uses as much as digits as its factorization.

47665561 is an evil number, because the sum of its binary digits is even.

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

The square root of 47665561 is about 6904.0249854704. The cubic root of 47665561 is about 362.5781006512.

The spelling of 47665561 in words is "forty-seven million, six hundred sixty-five thousand, five hundred sixty-one".