75619661 has 4 divisors (see below), whose sum is σ = 81436572. Its totient is φ = 69802752.

The previous prime is 75619637. The next prime is 75619673. The reversal of 75619661 is 16691657.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 18541636 + 57078025 = 4306^2 + 7555^2 .

It is a cyclic number.

It is not a de Polignac number, because 75619661 - 2¹⁸ = 75357517 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 (75619681) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2908436 + ... + 2908461.

It is an arithmetic number, because the mean of its divisors is an integer number (20359143).

Almost surely, 2^75619661 is an apocalyptic number.

It is an amenable number.

75619661 is a deficient number, since it is larger than the sum of its proper divisors (5816911).

75619661 is a wasteful number, since it uses less digits than its factorization.

75619661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5816910.

The product of its digits is 68040, while the sum is 41.

The square root of 75619661 is about 8695.9565891281. The cubic root of 75619661 is about 422.8745760220.

The spelling of 75619661 in words is "seventy-five million, six hundred nineteen thousand, six hundred sixty-one".