140685756561 has 81 divisors (see below), whose sum is σ = 241651764081. Its totient is φ = 78640982784.

The previous prime is 140685756551. The next prime is 140685756569. The reversal of 140685756561 is 165657586041.

The square root of 140685756561 is 375081.

It is a perfect power (a square), and thus also a powerful number.

140685756561 is a `hidden beast` number, since 1 + 4 + 0 + 6 + 8 + 5 + 75 + 6 + 561 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 15752961 + 140670003600 = 3969^2 + 375060^2 .

It is not a de Polignac number, because 140685756561 - 2¹¹ = 140685754513 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 140685756498 and 140685756507.

It is not an unprimeable number, because it can be changed into a prime (140685756569) by changing a digit.

It is a polite number, since it can be written in 80 ways as a sum of consecutive naturals, for example, 417464985 + ... + 417465321.

Almost surely, 2^140685756561 is an apocalyptic number.

140685756561 is the 375081-st square number.

140685756561 is the 187541-st centered octagonal number.

It is an amenable number.

140685756561 is a deficient number, since it is larger than the sum of its proper divisors (100966007520).

140685756561 is an frugal number, since it uses more digits than its factorization.

140685756561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 800 (or 400 counting only the distinct ones).

The product of its (nonzero) digits is 6048000, while the sum is 54.

The spelling of 140685756561 in words is "one hundred forty billion, six hundred eighty-five million, seven hundred fifty-six thousand, five hundred sixty-one".