76209538861 has 4 divisors (see below), whose sum is σ = 76604407132. Its totient is φ = 75814670592.

The previous prime is 76209538849. The next prime is 76209538871. The reversal of 76209538861 is 16883590267.

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 9444146761 + 66765392100 = 97181^2 + 258390^2 .

It is a cyclic number.

It is not a de Polignac number, because 76209538861 - 2⁷ = 76209538733 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 (76209538871) 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, 197433846 + ... + 197434231.

It is an arithmetic number, because the mean of its divisors is an integer number (19151101783).

Almost surely, 2^76209538861 is an apocalyptic number.

It is an amenable number.

76209538861 is a deficient number, since it is larger than the sum of its proper divisors (394868271).

76209538861 is a wasteful number, since it uses less digits than its factorization.

76209538861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 394868270.

The product of its (nonzero) digits is 4354560, while the sum is 55.

The spelling of 76209538861 in words is "seventy-six billion, two hundred nine million, five hundred thirty-eight thousand, eight hundred sixty-one".