13040779501 has 4 divisors (see below), whose sum is σ = 13041012604. Its totient is φ = 13040546400.

The previous prime is 13040779487. The next prime is 13040779559. The reversal of 13040779501 is 10597704031.

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 5542951401 + 7497828100 = 74451^2 + 86590^2 .

It is a 3-Lehmer number, since φ(13040779501) divides (13040779501-1)³.

It is a cyclic number.

It is not a de Polignac number, because 13040779501 - 2¹⁷ = 13040648429 is a prime.

It is a deceptive number, since it divides R_13040779500.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13040779571) 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, 23311 + ... + 163171.

It is an arithmetic number, because the mean of its divisors is an integer number (3260253151).

It is a Poulet number, since it divides 2^13040779500-1.

Almost surely, 2^13040779501 is an apocalyptic number.

13040779501 is the 93241-st pentagonal number.

It is an amenable number.

13040779501 is a deficient number, since it is larger than the sum of its proper divisors (233103).

13040779501 is an equidigital number, since it uses as much as digits as its factorization.

13040779501 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 233102.

The product of its (nonzero) digits is 26460, while the sum is 37.

The spelling of 13040779501 in words is "thirteen billion, forty million, seven hundred seventy-nine thousand, five hundred one".