1655006661 has 192 divisors, whose sum is σ = 3376429056. Its totient is φ = 790352640.

The previous prime is 1655006657. The next prime is 1655006681. The reversal of 1655006661 is 1666005561.

It is not a de Polignac number, because 1655006661 - 2² = 1655006657 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1655006611) by changing a digit.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 38488506 + ... + 38488548.

It is an arithmetic number, because the mean of its divisors is an integer number (17585568).

Almost surely, 2^1655006661 is an apocalyptic number.

1655006661 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1655006661 is an abundant number, since it is smaller than the sum of its proper divisors (1721422395).

1655006661 is an equidigital number, since it uses as much as digits as its factorization.

1655006661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 115 (or 81 counting only the distinct ones).

The product of its (nonzero) digits is 32400, while the sum is 36.

The square root of 1655006661 is about 40681.7730808282. The cubic root of 1655006661 is about 1182.8597355128.

The spelling of 1655006661 in words is "one billion, six hundred fifty-five million, six thousand, six hundred sixty-one".