71914149781 has 4 divisors (see below), whose sum is σ = 71914826752. Its totient is φ = 71913472812.

The previous prime is 71914149733. The next prime is 71914149809. The reversal of 71914149781 is 18794141917.

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, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 18794141917 = 13259 ⋅1417463.

It is a cyclic number.

It is not a de Polignac number, because 71914149781 - 2¹¹ = 71914147733 is a prime.

It is a super-2 number, since 2×71914149781² (a number of 23 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 (71914149701) 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, 140565 + ... + 404458.

It is an arithmetic number, because the mean of its divisors is an integer number (17978706688).

Almost surely, 2^71914149781 is an apocalyptic number.

It is an amenable number.

71914149781 is a deficient number, since it is larger than the sum of its proper divisors (676971).

71914149781 is a wasteful number, since it uses less digits than its factorization.

71914149781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 676970.

The product of its digits is 508032, while the sum is 52.

The spelling of 71914149781 in words is "seventy-one billion, nine hundred fourteen million, one hundred forty-nine thousand, seven hundred eighty-one".