81676109741 has 2 divisors, whose sum is σ = 81676109742. Its totient is φ = 81676109740.

The previous prime is 81676109729. The next prime is 81676109773. The reversal of 81676109741 is 14790167618.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 53186045641 + 28490064100 = 230621^2 + 168790^2 .

It is a cyclic number.

It is not a de Polignac number, because 81676109741 - 2⁶ = 81676109677 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 81676109741.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81676109941) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40838054870 + 40838054871.

It is an arithmetic number, because the mean of its divisors is an integer number (40838054871).

Almost surely, 2^81676109741 is an apocalyptic number.

It is an amenable number.

81676109741 is a deficient number, since it is larger than the sum of its proper divisors (1).

81676109741 is an equidigital number, since it uses as much as digits as its factorization.

81676109741 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 508032, while the sum is 50.

The spelling of 81676109741 in words is "eighty-one billion, six hundred seventy-six million, one hundred nine thousand, seven hundred forty-one".