1651605655 has 16 divisors (see below), whose sum is σ = 2296090944. Its totient is φ = 1117013760.

The previous prime is 1651605653. The next prime is 1651605671. The reversal of 1651605655 is 5565061561.

It is not a de Polignac number, because 1651605655 - 2¹ = 1651605653 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1651605653) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 320656 + ... + 325765.

It is an arithmetic number, because the mean of its divisors is an integer number (143505684).

Almost surely, 2^1651605655 is an apocalyptic number.

1651605655 is a deficient number, since it is larger than the sum of its proper divisors (644485289).

1651605655 is an equidigital number, since it uses as much as digits as its factorization.

1651605655 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 646506.

The product of its (nonzero) digits is 135000, while the sum is 40.

The square root of 1651605655 is about 40639.9514640458. The cubic root of 1651605655 is about 1182.0489287304.

The spelling of 1651605655 in words is "one billion, six hundred fifty-one million, six hundred five thousand, six hundred fifty-five".