77889498877 has 4 divisors (see below), whose sum is σ = 77958489820. Its totient is φ = 77820507936.

The previous prime is 77889498847. The next prime is 77889498887.

77889498877 is nontrivially palindromic in base 10.

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 4321616121 + 73567882756 = 65739^2 + 271234^2 .

It is a cyclic number.

It is not a de Polignac number, because 77889498877 - 2¹¹ = 77889496829 is a prime.

It is a super-2 number, since 2×77889498877² (a number of 23 digits) contains 22 as substring.

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 77889498877.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77889498847) 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, 34493778 + ... + 34496035.

It is an arithmetic number, because the mean of its divisors is an integer number (19489622455).

Almost surely, 2^77889498877 is an apocalyptic number.

It is an amenable number.

77889498877 is a deficient number, since it is larger than the sum of its proper divisors (68990943).

77889498877 is a wasteful number, since it uses less digits than its factorization.

77889498877 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68990942.

The product of its digits is 3186376704, while the sum is 82.

The spelling of 77889498877 in words is "seventy-seven billion, eight hundred eighty-nine million, four hundred ninety-eight thousand, eight hundred seventy-seven".