77480697409 has 4 divisors (see below), whose sum is σ = 77490008260. Its totient is φ = 77471386560.

The previous prime is 77480697407. The next prime is 77480697431. The reversal of 77480697409 is 90479608477.

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 13865769009 + 63614928400 = 117753^2 + 252220^2 .

It is a cyclic number.

It is not a de Polignac number, because 77480697409 - 2¹ = 77480697407 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (77480697407) 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, 4642932 + ... + 4659589.

It is an arithmetic number, because the mean of its divisors is an integer number (19372502065).

Almost surely, 2^77480697409 is an apocalyptic number.

It is an amenable number.

77480697409 is a deficient number, since it is larger than the sum of its proper divisors (9310851).

77480697409 is an equidigital number, since it uses as much as digits as its factorization.

77480697409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9310850.

The product of its (nonzero) digits is 21337344, while the sum is 61.

The spelling of 77480697409 in words is "seventy-seven billion, four hundred eighty million, six hundred ninety-seven thousand, four hundred nine".