75512661 has 16 divisors (see below), whose sum is σ = 115657344. Its totient is φ = 42928704.

The previous prime is 75512659. The next prime is 75512677. The reversal of 75512661 is 16621557.

It is not a de Polignac number, because 75512661 - 2¹ = 75512659 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (75512681) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4990 + ... + 13263.

It is an arithmetic number, because the mean of its divisors is an integer number (7228584).

Almost surely, 2^75512661 is an apocalyptic number.

It is an amenable number.

75512661 is a deficient number, since it is larger than the sum of its proper divisors (40144683).

75512661 is a wasteful number, since it uses less digits than its factorization.

75512661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18460.

The product of its digits is 12600, while the sum is 33.

The square root of 75512661 is about 8689.8021266310. The cubic root of 75512661 is about 422.6750294259.

The spelling of 75512661 in words is "seventy-five million, five hundred twelve thousand, six hundred sixty-one".