75810661 has 2 divisors, whose sum is σ = 75810662. Its totient is φ = 75810660.

The previous prime is 75810659. The next prime is 75810673. The reversal of 75810661 is 16601857.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 69205761 + 6604900 = 8319^2 + 2570^2 .

It is a cyclic number.

It is not a de Polignac number, because 75810661 - 2¹ = 75810659 is a prime.

Together with 75810659, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (75810601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37905330 + 37905331.

It is an arithmetic number, because the mean of its divisors is an integer number (37905331).

Almost surely, 2^75810661 is an apocalyptic number.

It is an amenable number.

75810661 is a deficient number, since it is larger than the sum of its proper divisors (1).

75810661 is an equidigital number, since it uses as much as digits as its factorization.

75810661 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10080, while the sum is 34.

The square root of 75810661 is about 8706.9317787611. The cubic root of 75810661 is about 423.2303086278.

The spelling of 75810661 in words is "seventy-five million, eight hundred ten thousand, six hundred sixty-one".