75477804121 has 4 divisors (see below), whose sum is σ = 75487890100. Its totient is φ = 75467718144.

The previous prime is 75477804109. The next prime is 75477804163. The reversal of 75477804121 is 12140877457.

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 29519019721 + 45958784400 = 171811^2 + 214380^2 .

It is a cyclic number.

It is not a de Polignac number, because 75477804121 - 2⁵ = 75477804089 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (75477804421) 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, 5031756 + ... + 5046733.

It is an arithmetic number, because the mean of its divisors is an integer number (18871972525).

Almost surely, 2^75477804121 is an apocalyptic number.

It is an amenable number.

75477804121 is a deficient number, since it is larger than the sum of its proper divisors (10085979).

75477804121 is a wasteful number, since it uses less digits than its factorization.

75477804121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10085978.

The product of its (nonzero) digits is 439040, while the sum is 46.

The spelling of 75477804121 in words is "seventy-five billion, four hundred seventy-seven million, eight hundred four thousand, one hundred twenty-one".