80721779043 has 8 divisors (see below), whose sum is σ = 107638086400. Its totient is φ = 53809995528.

The previous prime is 80721779029. The next prime is 80721779057. The reversal of 80721779043 is 34097712708.

It is an interprime number because it is at equal distance from previous prime (80721779029) and next prime (80721779057).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 80721779043 - 2¹³ = 80721770851 is a prime.

It is a super-2 number, since 2×80721779043² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 80721778983 and 80721779001.

It is not an unprimeable number, because it can be changed into a prime (80721779023) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1089103 + ... + 1160856.

It is an arithmetic number, because the mean of its divisors is an integer number (13454760800).

Almost surely, 2^80721779043 is an apocalyptic number.

80721779043 is a deficient number, since it is larger than the sum of its proper divisors (26916307357).

80721779043 is a wasteful number, since it uses less digits than its factorization.

80721779043 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2261921.

The product of its (nonzero) digits is 592704, while the sum is 48.

The spelling of 80721779043 in words is "eighty billion, seven hundred twenty-one million, seven hundred seventy-nine thousand, forty-three".