81770140340451 has 32 divisors (see below), whose sum is σ = 121593591936000. Its totient is φ = 54309745109664.

The previous prime is 81770140340443. The next prime is 81770140340461. The reversal of 81770140340451 is 15404304107718.

81770140340451 is a `hidden beast` number, since 8 + 17 + 7 + 0 + 140 + 3 + 40 + 451 = 666.

It is not a de Polignac number, because 81770140340451 - 2³ = 81770140340443 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 81770140340397 and 81770140340406.

It is not an unprimeable number, because it can be changed into a prime (81770140340461) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 691952296 + ... + 692070458.

It is an arithmetic number, because the mean of its divisors is an integer number (3799799748000).

Almost surely, 2^{81770140340451} is an apocalyptic number.

81770140340451 is a deficient number, since it is larger than the sum of its proper divisors (39823451595549).

81770140340451 is a wasteful number, since it uses less digits than its factorization.

81770140340451 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 213720 (or 213714 counting only the distinct ones).

The product of its (nonzero) digits is 376320, while the sum is 45.

The spelling of 81770140340451 in words is "eighty-one trillion, seven hundred seventy billion, one hundred forty million, three hundred forty thousand, four hundred fifty-one".