75315661 has 16 divisors (see below), whose sum is σ = 82171584. Its totient is φ = 68753664.

The previous prime is 75315641. The next prime is 75315671. The reversal of 75315661 is 16651357.

It is a cyclic number.

It is not a de Polignac number, because 75315661 - 2⁷ = 75315533 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (75315641) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 143746 + ... + 144268.

It is an arithmetic number, because the mean of its divisors is an integer number (5135724).

Almost surely, 2^75315661 is an apocalyptic number.

It is an amenable number.

75315661 is a deficient number, since it is larger than the sum of its proper divisors (6855923).

75315661 is a wasteful number, since it uses less digits than its factorization.

75315661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 780.

The product of its digits is 18900, while the sum is 34.

The square root of 75315661 is about 8678.4595983389. The cubic root of 75315661 is about 422.3071463242.

The spelling of 75315661 in words is "seventy-five million, three hundred fifteen thousand, six hundred sixty-one".