81773277687162 has 48 divisors (see below), whose sum is σ = 178762308234120. Its totient is φ = 27014517518976.

The previous prime is 81773277687109. The next prime is 81773277687181. The reversal of 81773277687162 is 26178677237718.

It is a happy number.

81773277687162 is a `hidden beast` number, since 8 + 1 + 77 + 327 + 76 + 8 + 7 + 162 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 68340825456201 + 13432452230961 = 8266851^2 + 3665031^2 .

It is a super-2 number, since 2×81773277687162² (a number of 29 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 36093553 + ... + 38292180.

Almost surely, 2^{81773277687162} is an apocalyptic number.

81773277687162 is an abundant number, since it is smaller than the sum of its proper divisors (96989030546958).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

81773277687162 is a wasteful number, since it uses less digits than its factorization.

81773277687162 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74386287 (or 74386284 counting only the distinct ones).

The product of its digits is 464679936, while the sum is 72.

The spelling of 81773277687162 in words is "eighty-one trillion, seven hundred seventy-three billion, two hundred seventy-seven million, six hundred eighty-seven thousand, one hundred sixty-two".