1655604643 has 24 divisors (see below), whose sum is σ = 2086870016. Its totient is φ = 1285677360.

The previous prime is 1655604581. The next prime is 1655604649. The reversal of 1655604643 is 3464065561.

It is not a de Polignac number, because 1655604643 - 2¹³ = 1655596451 is a prime.

It is a super-3 number, since 3×1655604643³ (a number of 29 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1655604596 and 1655604605.

It is not an unprimeable number, because it can be changed into a prime (1655604649) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 256846 + ... + 263212.

Almost surely, 2^1655604643 is an apocalyptic number.

1655604643 is a deficient number, since it is larger than the sum of its proper divisors (431265373).

1655604643 is a wasteful number, since it uses less digits than its factorization.

1655604643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6703 (or 6692 counting only the distinct ones).

The product of its (nonzero) digits is 259200, while the sum is 40.

The square root of 1655604643 is about 40689.1219246619. The cubic root of 1655604643 is about 1183.0021807920.

The spelling of 1655604643 in words is "one billion, six hundred fifty-five million, six hundred four thousand, six hundred forty-three".