645848550 has 36 divisors (see below), whose sum is σ = 1735180980. Its totient is φ = 172226160.

The previous prime is 645848549. The next prime is 645848569. The reversal of 645848550 is 55848546.

645848550 is a `hidden beast` number, since 6 + 4 + 58 + 48 + 550 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 645848496 and 645848505.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 717160 + ... + 718059.

Almost surely, 2^645848550 is an apocalyptic number.

645848550 is an abundant number, since it is smaller than the sum of its proper divisors (1089332430).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

645848550 is a wasteful number, since it uses less digits than its factorization.

645848550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1435237 (or 1435229 counting only the distinct ones).

The product of its (nonzero) digits is 768000, while the sum is 45.

The square root of 645848550 is about 25413.5505193588. The cubic root of 645848550 is about 864.3909865558.

The spelling of 645848550 in words is "six hundred forty-five million, eight hundred forty-eight thousand, five hundred fifty".