75087616981 has 4 divisors (see below), whose sum is σ = 80863587532. Its totient is φ = 69311646432.

The previous prime is 75087616973. The next prime is 75087616987. The reversal of 75087616981 is 18961678057.

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 3388986225 + 71698630756 = 58215^2 + 267766^2 .

It is a cyclic number.

It is not a de Polignac number, because 75087616981 - 2³ = 75087616973 is a prime.

It is a super-2 number, since 2×75087616981² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (75087616987) 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, 2887985256 + ... + 2887985281.

It is an arithmetic number, because the mean of its divisors is an integer number (20215896883).

Almost surely, 2^75087616981 is an apocalyptic number.

It is an amenable number.

75087616981 is a deficient number, since it is larger than the sum of its proper divisors (5775970551).

75087616981 is a wasteful number, since it uses less digits than its factorization.

75087616981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5775970550.

The product of its (nonzero) digits is 5080320, while the sum is 58.

The spelling of 75087616981 in words is "seventy-five billion, eighty-seven million, six hundred sixteen thousand, nine hundred eighty-one".