1655335561 has 8 divisors (see below), whose sum is σ = 1823701248. Its totient is φ = 1489950000.

The previous prime is 1655335547. The next prime is 1655335601.

It is a happy number.

1655335561 is nontrivially palindromic in base 10.

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

It is not a de Polignac number, because 1655335561 - 2¹¹ = 1655333513 is a prime.

It is a super-2 number, since 2×1655335561² = 5480271639022369442, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1655335511) 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, 743865 + ... + 746086.

It is an arithmetic number, because the mean of its divisors is an integer number (227962656).

Almost surely, 2^1655335561 is an apocalyptic number.

1655335561 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1655335561 is a deficient number, since it is larger than the sum of its proper divisors (168365687).

1655335561 is a wasteful number, since it uses less digits than its factorization.

1655335561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1490063.

The product of its digits is 202500, while the sum is 40.

The square root of 1655335561 is about 40685.8152308639. The cubic root of 1655335561 is about 1182.9380870199.

The spelling of 1655335561 in words is "one billion, six hundred fifty-five million, three hundred thirty-five thousand, five hundred sixty-one".