80381559406949 has 4 divisors (see below), whose sum is σ = 80466439618464. Its totient is φ = 80296679195436.

The previous prime is 80381559406919. The next prime is 80381559406957. The reversal of 80381559406949 is 94960495518308.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 80381559406949 - 2⁴⁰ = 79282047779173 is a prime.

It is a super-2 number, since 2×80381559406949² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (80381559406919) 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, 42440104337 + ... + 42440106230.

It is an arithmetic number, because the mean of its divisors is an integer number (20116609904616).

Almost surely, 2^{80381559406949} is an apocalyptic number.

It is an amenable number.

80381559406949 is a deficient number, since it is larger than the sum of its proper divisors (84880211515).

80381559406949 is an equidigital number, since it uses as much as digits as its factorization.

80381559406949 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84880211514.

The product of its (nonzero) digits is 335923200, while the sum is 71.

The spelling of 80381559406949 in words is "eighty trillion, three hundred eighty-one billion, five hundred fifty-nine million, four hundred six thousand, nine hundred forty-nine".