81774440166711 has 16 divisors (see below), whose sum is σ = 109046166828416. Its totient is φ = 54509503909536.

The previous prime is 81774440166707. The next prime is 81774440166737. The reversal of 81774440166711 is 11766104447718.

It is not a de Polignac number, because 81774440166711 - 2² = 81774440166707 is a prime.

It is a super-2 number, since 2×81774440166711² (a number of 29 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 (81774440166011) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1386847716 + ... + 1386906678.

It is an arithmetic number, because the mean of its divisors is an integer number (6815385426776).

Almost surely, 2^{81774440166711} is an apocalyptic number.

81774440166711 is a deficient number, since it is larger than the sum of its proper divisors (27271726661705).

81774440166711 is a wasteful number, since it uses less digits than its factorization.

81774440166711 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 108702.

The product of its (nonzero) digits is 6322176, while the sum is 57.

The spelling of 81774440166711 in words is "eighty-one trillion, seven hundred seventy-four billion, four hundred forty million, one hundred sixty-six thousand, seven hundred eleven".