6615745541 has 2 divisors, whose sum is σ = 6615745542. Its totient is φ = 6615745540.

The previous prime is 6615745529. The next prime is 6615745571. The reversal of 6615745541 is 1455475166.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6549664900 + 66080641 = 80930^2 + 8129^2 .

It is a cyclic number.

It is not a de Polignac number, because 6615745541 - 2¹⁸ = 6615483397 is a prime.

It is a super-2 number, since 2×6615745541² = 87536178126522765362, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 6615745492 and 6615745501.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6615745571) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3307872770 + 3307872771.

It is an arithmetic number, because the mean of its divisors is an integer number (3307872771).

Almost surely, 2^6615745541 is an apocalyptic number.

It is an amenable number.

6615745541 is a deficient number, since it is larger than the sum of its proper divisors (1).

6615745541 is an equidigital number, since it uses as much as digits as its factorization.

6615745541 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 504000, while the sum is 44.

The square root of 6615745541 is about 81337.2334235681. The cubic root of 6615745541 is about 1877.2679439885.

The spelling of 6615745541 in words is "six billion, six hundred fifteen million, seven hundred forty-five thousand, five hundred forty-one".