686272281642 has 24 divisors (see below), whose sum is σ = 1491335525316. Its totient is φ = 228078619776.

The previous prime is 686272281641. The next prime is 686272281659. The reversal of 686272281642 is 246182272686.

686272281642 is a `hidden beast` number, since 6 + 8 + 627 + 2 + 2 + 8 + 1 + 6 + 4 + 2 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 679571058321 + 6701223321 = 824361^2 + 81861^2 .

It is not an unprimeable number, because it can be changed into a prime (686272281641) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 56561053 + ... + 56573184.

Almost surely, 2^686272281642 is an apocalyptic number.

686272281642 is an abundant number, since it is smaller than the sum of its proper divisors (805063243674).

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

686272281642 is a wasteful number, since it uses less digits than its factorization.

686272281642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 113134582 (or 113134579 counting only the distinct ones).

The product of its digits is 6193152, while the sum is 54.

The spelling of 686272281642 in words is "six hundred eighty-six billion, two hundred seventy-two million, two hundred eighty-one thousand, six hundred forty-two".