74681876981 has 2 divisors, whose sum is σ = 74681876982. Its totient is φ = 74681876980.

The previous prime is 74681876963. The next prime is 74681876989. The reversal of 74681876981 is 18967818647.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 61570481956 + 13111395025 = 248134^2 + 114505^2 .

It is a cyclic number.

It is not a de Polignac number, because 74681876981 - 2¹⁴ = 74681860597 is a prime.

It is a super-2 number, since 2×74681876981² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (74681876989) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37340938490 + 37340938491.

It is an arithmetic number, because the mean of its divisors is an integer number (37340938491).

Almost surely, 2^74681876981 is an apocalyptic number.

It is an amenable number.

74681876981 is a deficient number, since it is larger than the sum of its proper divisors (1).

74681876981 is an equidigital number, since it uses as much as digits as its factorization.

74681876981 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 32514048, while the sum is 65.

The spelling of 74681876981 in words is "seventy-four billion, six hundred eighty-one million, eight hundred seventy-six thousand, nine hundred eighty-one".