645887153 has 2 divisors, whose sum is σ = 645887154. Its totient is φ = 645887152.

The previous prime is 645887141. The next prime is 645887189. The reversal of 645887153 is 351788546.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 387577969 + 258309184 = 19687^2 + 16072^2 .

It is a cyclic number.

It is not a de Polignac number, because 645887153 - 2⁶ = 645887089 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 645887098 and 645887107.

It is not a weakly prime, because it can be changed into another prime (645883153) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 322943576 + 322943577.

It is an arithmetic number, because the mean of its divisors is an integer number (322943577).

Almost surely, 2^645887153 is an apocalyptic number.

It is an amenable number.

645887153 is a deficient number, since it is larger than the sum of its proper divisors (1).

645887153 is an equidigital number, since it uses as much as digits as its factorization.

645887153 is an evil number, because the sum of its binary digits is even.

The product of its digits is 806400, while the sum is 47.

The square root of 645887153 is about 25414.3100044050. The cubic root of 645887153 is about 864.4082080445.

It can be divided in two parts, 645887 and 153, that multiplied together give a triangular number (98820711 = T₁₄₀₅₈).

The spelling of 645887153 in words is "six hundred forty-five million, eight hundred eighty-seven thousand, one hundred fifty-three".