80811821511413 has 4 divisors (see below), whose sum is σ = 81918832765068. Its totient is φ = 79704810257760.

The previous prime is 80811821511371. The next prime is 80811821511481. The reversal of 80811821511413 is 31411512811808.

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 36236463026929 + 44575358484484 = 6019673^2 + 6676478^2 .

It is a cyclic number.

It is not a de Polignac number, because 80811821511413 - 2⁴² = 76413775000309 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (80811821511493) 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, 553505626718 + ... + 553505626863.

It is an arithmetic number, because the mean of its divisors is an integer number (20479708191267).

Almost surely, 2^{80811821511413} is an apocalyptic number.

It is an amenable number.

80811821511413 is a deficient number, since it is larger than the sum of its proper divisors (1107011253655).

80811821511413 is a wasteful number, since it uses less digits than its factorization.

80811821511413 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1107011253654.

The product of its (nonzero) digits is 61440, while the sum is 44.

The spelling of 80811821511413 in words is "eighty trillion, eight hundred eleven billion, eight hundred twenty-one million, five hundred eleven thousand, four hundred thirteen".