1656661061 has 8 divisors (see below), whose sum is σ = 1807675104. Its totient is φ = 1505715120.

The previous prime is 1656661057. The next prime is 1656661063. The reversal of 1656661061 is 1601666561.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 1656661061 - 2² = 1656661057 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1656661063) 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, 43091 + ... + 71903.

It is an arithmetic number, because the mean of its divisors is an integer number (225959388).

Almost surely, 2^1656661061 is an apocalyptic number.

1656661061 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1656661061 is a deficient number, since it is larger than the sum of its proper divisors (151014043).

1656661061 is a wasteful number, since it uses less digits than its factorization.

1656661061 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34051.

The product of its (nonzero) digits is 38880, while the sum is 38.

The square root of 1656661061 is about 40702.1014322357. The cubic root of 1656661061 is about 1183.2537463016.

The spelling of 1656661061 in words is "one billion, six hundred fifty-six million, six hundred sixty-one thousand, sixty-one".