75661078541 has 4 divisors (see below), whose sum is σ = 75919307772. Its totient is φ = 75402849312.

The previous prime is 75661078523. The next prime is 75661078573. The reversal of 75661078541 is 14587016657.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 14587016657 = 14591 ⋅999727.

It can be written as a sum of positive squares in 2 ways, for example, as 71893696900 + 3767381641 = 268130^2 + 61379^2 .

It is a cyclic number.

It is not a de Polignac number, because 75661078541 - 2¹⁸ = 75660816397 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 75661078541.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (75661072541) 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, 129114176 + ... + 129114761.

It is an arithmetic number, because the mean of its divisors is an integer number (18979826943).

Almost surely, 2^75661078541 is an apocalyptic number.

It is an amenable number.

75661078541 is a deficient number, since it is larger than the sum of its proper divisors (258229231).

75661078541 is a wasteful number, since it uses less digits than its factorization.

75661078541 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 258229230.

The product of its (nonzero) digits is 1411200, while the sum is 50.

The spelling of 75661078541 in words is "seventy-five billion, six hundred sixty-one million, seventy-eight thousand, five hundred forty-one".