681662440627 has 16 divisors (see below), whose sum is σ = 786020405760. Its totient is φ = 579049978752.

The previous prime is 681662440619. The next prime is 681662440673. The reversal of 681662440627 is 726044266186.

It is not a de Polignac number, because 681662440627 - 2³ = 681662440619 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (681662441627) 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, 8394024 + ... + 8474842.

It is an arithmetic number, because the mean of its divisors is an integer number (49126275360).

Almost surely, 2^681662440627 is an apocalyptic number.

681662440627 is a deficient number, since it is larger than the sum of its proper divisors (104357965133).

681662440627 is a wasteful number, since it uses less digits than its factorization.

681662440627 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 91602.

The product of its (nonzero) digits is 4644864, while the sum is 52.

The spelling of 681662440627 in words is "six hundred eighty-one billion, six hundred sixty-two million, four hundred forty thousand, six hundred twenty-seven".