75837661 has 4 divisors (see below), whose sum is σ = 76081824. Its totient is φ = 75593500.

The previous prime is 75837653. The next prime is 75837667. The reversal of 75837661 is 16673857.

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, and also an emirpimes, since its reverse is a distinct semiprime: 16673857 = 73 ⋅228409.

It is a cyclic number.

It is not a de Polignac number, because 75837661 - 2³ = 75837653 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 (75837667) 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, 121615 + ... + 122236.

It is an arithmetic number, because the mean of its divisors is an integer number (19020456).

Almost surely, 2^75837661 is an apocalyptic number.

It is an amenable number.

75837661 is a deficient number, since it is larger than the sum of its proper divisors (244163).

75837661 is a wasteful number, since it uses less digits than its factorization.

75837661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 244162.

The product of its digits is 211680, while the sum is 43.

The square root of 75837661 is about 8708.4821295103. The cubic root of 75837661 is about 423.2805472172.

The spelling of 75837661 in words is "seventy-five million, eight hundred thirty-seven thousand, six hundred sixty-one".