77248489489 has 4 divisors (see below), whose sum is σ = 77267459556. Its totient is φ = 77229519424.

The previous prime is 77248489469. The next prime is 77248489523. The reversal of 77248489489 is 98498484277.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 98498484277 = 67 ⋅1470126631.

It can be written as a sum of positive squares in 2 ways, for example, as 3125704464 + 74122785025 = 55908^2 + 272255^2 .

It is a cyclic number.

It is not a de Polignac number, because 77248489489 - 2¹⁵ = 77248456721 is a prime.

It is a super-2 number, since 2×77248489489² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (77248489469) 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, 9478924 + ... + 9487069.

It is an arithmetic number, because the mean of its divisors is an integer number (19316864889).

Almost surely, 2^77248489489 is an apocalyptic number.

It is an amenable number.

77248489489 is a deficient number, since it is larger than the sum of its proper divisors (18970067).

77248489489 is a wasteful number, since it uses less digits than its factorization.

77248489489 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18970066.

The product of its digits is 260112384, while the sum is 70.

The spelling of 77248489489 in words is "seventy-seven billion, two hundred forty-eight million, four hundred eighty-nine thousand, four hundred eighty-nine".