77172237889 has 4 divisors (see below), whose sum is σ = 81233934640. Its totient is φ = 73110541140.

The previous prime is 77172237887. The next prime is 77172237907. The reversal of 77172237889 is 98873227177.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 98873227177 = 3793 ⋅26067289.

It is a cyclic number.

It is not a de Polignac number, because 77172237889 - 2¹ = 77172237887 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (77172237887) 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, 2030848347 + ... + 2030848384.

It is an arithmetic number, because the mean of its divisors is an integer number (20308483660).

Almost surely, 2^77172237889 is an apocalyptic number.

It is an amenable number.

77172237889 is a deficient number, since it is larger than the sum of its proper divisors (4061696751).

77172237889 is a wasteful number, since it uses less digits than its factorization.

77172237889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4061696750.

The product of its digits is 16595712, while the sum is 61.

The spelling of 77172237889 in words is "seventy-seven billion, one hundred seventy-two million, two hundred thirty-seven thousand, eight hundred eighty-nine".