662681957561 has 8 divisors (see below), whose sum is σ = 720327190464. Its totient is φ = 605989538640.

The previous prime is 662681957543. The next prime is 662681957563. The reversal of 662681957561 is 165759186266.

662681957561 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-662681957561 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 662681957494 and 662681957503.

It is not an unprimeable number, because it can be changed into a prime (662681957563) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 238202045 + ... + 238204826.

It is an arithmetic number, because the mean of its divisors is an integer number (90040898808).

Almost surely, 2^662681957561 is an apocalyptic number.

It is an amenable number.

662681957561 is a deficient number, since it is larger than the sum of its proper divisors (57645232903).

662681957561 is a wasteful number, since it uses less digits than its factorization.

662681957561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 476406991.

The product of its digits is 32659200, while the sum is 62.

The spelling of 662681957561 in words is "six hundred sixty-two billion, six hundred eighty-one million, nine hundred fifty-seven thousand, five hundred sixty-one".