75447661 has 2 divisors, whose sum is σ = 75447662. Its totient is φ = 75447660.

The previous prime is 75447641. The next prime is 75447677. The reversal of 75447661 is 16674457.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 39375625 + 36072036 = 6275^2 + 6006^2 .

It is a cyclic number.

It is not a de Polignac number, because 75447661 - 2⁵ = 75447629 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (75447601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37723830 + 37723831.

It is an arithmetic number, because the mean of its divisors is an integer number (37723831).

Almost surely, 2^75447661 is an apocalyptic number.

It is an amenable number.

75447661 is a deficient number, since it is larger than the sum of its proper divisors (1).

75447661 is an equidigital number, since it uses as much as digits as its factorization.

75447661 is an evil number, because the sum of its binary digits is even.

The product of its digits is 141120, while the sum is 40.

The square root of 75447661 is about 8686.0613053328. The cubic root of 75447661 is about 422.5537174793.

The spelling of 75447661 in words is "seventy-five million, four hundred forty-seven thousand, six hundred sixty-one".