655401645 has 16 divisors (see below), whose sum is σ = 1165158720. Its totient is φ = 349547472.

The previous prime is 655401613. The next prime is 655401671. The reversal of 655401645 is 546104556.

655401645 is a `hidden beast` number, since 6 + 5 + 5 + 4 + 0 + 1 + 645 = 666.

It is not a de Polignac number, because 655401645 - 2⁵ = 655401613 is a prime.

It is a super-3 number, since 3×655401645³ (a number of 27 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

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, 2427279 + ... + 2427548.

It is an arithmetic number, because the mean of its divisors is an integer number (72822420).

Almost surely, 2^655401645 is an apocalyptic number.

It is an amenable number.

655401645 is a deficient number, since it is larger than the sum of its proper divisors (509757075).

655401645 is a wasteful number, since it uses less digits than its factorization.

655401645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4854841 (or 4854835 counting only the distinct ones).

The product of its (nonzero) digits is 72000, while the sum is 36.

The square root of 655401645 is about 25600.8133659851. The cubic root of 655401645 is about 868.6320356709.

The spelling of 655401645 in words is "six hundred fifty-five million, four hundred one thousand, six hundred forty-five".