75686118661 has 4 divisors (see below), whose sum is σ = 76263875424. Its totient is φ = 75108361900.

The previous prime is 75686118647. The next prime is 75686118667. The reversal of 75686118661 is 16681168657.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 75686118661 - 2¹¹ = 75686116613 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 (75686118667) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 288878185 + ... + 288878446.

It is an arithmetic number, because the mean of its divisors is an integer number (19065968856).

Almost surely, 2^75686118661 is an apocalyptic number.

It is an amenable number.

75686118661 is a deficient number, since it is larger than the sum of its proper divisors (577756763).

75686118661 is a wasteful number, since it uses less digits than its factorization.

75686118661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 577756762.

The product of its digits is 2903040, while the sum is 55.

The spelling of 75686118661 in words is "seventy-five billion, six hundred eighty-six million, one hundred eighteen thousand, six hundred sixty-one".