71819776141 has 4 divisors (see below), whose sum is σ = 71974894912. Its totient is φ = 71664657372.

The previous prime is 71819776139. The next prime is 71819776157. The reversal of 71819776141 is 14167791817.

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 71819776141 - 2¹ = 71819776139 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 (71819776741) 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, 77558691 + ... + 77559616.

It is an arithmetic number, because the mean of its divisors is an integer number (17993723728).

Almost surely, 2^71819776141 is an apocalyptic number.

It is an amenable number.

71819776141 is a deficient number, since it is larger than the sum of its proper divisors (155118771).

71819776141 is a wasteful number, since it uses less digits than its factorization.

71819776141 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 155118770.

The product of its digits is 592704, while the sum is 52.

The spelling of 71819776141 in words is "seventy-one billion, eight hundred nineteen million, seven hundred seventy-six thousand, one hundred forty-one".