75111661 has 8 divisors (see below), whose sum is σ = 80879040. Its totient is φ = 69494208.

The previous prime is 75111649. The next prime is 75111683. The reversal of 75111661 is 16611157.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 75111661 - 2¹⁵ = 75078893 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 (75114661) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 36441 + ... + 38446.

It is an arithmetic number, because the mean of its divisors is an integer number (10109880).

Almost surely, 2^75111661 is an apocalyptic number.

It is an amenable number.

75111661 is a deficient number, since it is larger than the sum of its proper divisors (5767379).

75111661 is a wasteful number, since it uses less digits than its factorization.

75111661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74963.

The product of its digits is 1260, while the sum is 28.

The square root of 75111661 is about 8666.6983909676. The cubic root of 75111661 is about 421.9255145073.

The spelling of 75111661 in words is "seventy-five million, one hundred eleven thousand, six hundred sixty-one".