75807661 has 4 divisors (see below), whose sum is σ = 76050172. Its totient is φ = 75565152.

The previous prime is 75807659. The next prime is 75807703. The reversal of 75807661 is 16670857.

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 656100 + 75151561 = 810^2 + 8669^2 .

It is a cyclic number.

It is not a de Polignac number, because 75807661 - 2¹ = 75807659 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 (75807601) 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, 120786 + ... + 121411.

It is an arithmetic number, because the mean of its divisors is an integer number (19012543).

Almost surely, 2^75807661 is an apocalyptic number.

It is an amenable number.

75807661 is a deficient number, since it is larger than the sum of its proper divisors (242511).

75807661 is a wasteful number, since it uses less digits than its factorization.

75807661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 242510.

The product of its (nonzero) digits is 70560, while the sum is 40.

The square root of 75807661 is about 8706.7595005260. The cubic root of 75807661 is about 423.2247258261.

The spelling of 75807661 in words is "seventy-five million, eight hundred seven thousand, six hundred sixty-one".