13409615977 has 4 divisors (see below), whose sum is σ = 13409928916. Its totient is φ = 13409303040.

The previous prime is 13409615971. The next prime is 13409615983. The reversal of 13409615977 is 77951690431.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (13409615971) and next prime (13409615983).

It can be written as a sum of positive squares in 2 ways, for example, as 10496207401 + 2913408576 = 102451^2 + 53976^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13409615977 is a prime.

It is a super-2 number, since 2×13409615977² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13409615971) 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, 79608 + ... + 182089.

It is an arithmetic number, because the mean of its divisors is an integer number (3352482229).

Almost surely, 2^13409615977 is an apocalyptic number.

It is an amenable number.

13409615977 is a deficient number, since it is larger than the sum of its proper divisors (312939).

13409615977 is an equidigital number, since it uses as much as digits as its factorization.

13409615977 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 312938.

The product of its (nonzero) digits is 1428840, while the sum is 52.

The spelling of 13409615977 in words is "thirteen billion, four hundred nine million, six hundred fifteen thousand, nine hundred seventy-seven".