76191122781 has 6 divisors (see below), whose sum is σ = 110053844030. Its totient is φ = 50794081848.

The previous prime is 76191122741. The next prime is 76191122807. The reversal of 76191122781 is 18722119167.

It is a happy number.

76191122781 is a `hidden beast` number, since 7 + 619 + 1 + 1 + 2 + 27 + 8 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 73370556900 + 2820565881 = 270870^2 + 53109^2 .

It is not a de Polignac number, because 76191122781 - 2²¹ = 76189025629 is a prime.

It is a super-2 number, since 2×76191122781² (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 (76191122701) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4232840146 + ... + 4232840163.

Almost surely, 2^76191122781 is an apocalyptic number.

It is an amenable number.

76191122781 is a deficient number, since it is larger than the sum of its proper divisors (33862721249).

76191122781 is a wasteful number, since it uses less digits than its factorization.

76191122781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8465680315 (or 8465680312 counting only the distinct ones).

The product of its digits is 84672, while the sum is 45.

The spelling of 76191122781 in words is "seventy-six billion, one hundred ninety-one million, one hundred twenty-two thousand, seven hundred eighty-one".