75517661 has 2 divisors, whose sum is σ = 75517662. Its totient is φ = 75517660.

The previous prime is 75517639. The next prime is 75517693. The reversal of 75517661 is 16671557.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 68989636 + 6528025 = 8306^2 + 2555^2 .

It is a cyclic number.

It is not a de Polignac number, because 75517661 - 2⁶ = 75517597 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (75517061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37758830 + 37758831.

It is an arithmetic number, because the mean of its divisors is an integer number (37758831).

Almost surely, 2^75517661 is an apocalyptic number.

It is an amenable number.

75517661 is a deficient number, since it is larger than the sum of its proper divisors (1).

75517661 is an equidigital number, since it uses as much as digits as its factorization.

75517661 is an evil number, because the sum of its binary digits is even.

The product of its digits is 44100, while the sum is 38.

The square root of 75517661 is about 8690.0898154162. The cubic root of 75517661 is about 422.6843582302.

The spelling of 75517661 in words is "seventy-five million, five hundred seventeen thousand, six hundred sixty-one".