645777153 has 24 divisors (see below), whose sum is σ = 1067206400. Its totient is φ = 368613504.

The previous prime is 645777137. The next prime is 645777161. The reversal of 645777153 is 351777546.

645777153 is a `hidden beast` number, since 6 + 4 + 577 + 71 + 5 + 3 = 666.

645777153 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 645777153 - 2⁴ = 645777137 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 645777099 and 645777108.

It is not an unprimeable number, because it can be changed into a prime (645777193) 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, 58488 + ... + 68646.

Almost surely, 2^645777153 is an apocalyptic number.

645777153 is a gapful number since it is divisible by the number (63) formed by its first and last digit.

It is an amenable number.

645777153 is a deficient number, since it is larger than the sum of its proper divisors (421429247).

645777153 is a wasteful number, since it uses less digits than its factorization.

645777153 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11181 (or 11178 counting only the distinct ones).

The product of its digits is 617400, while the sum is 45.

The square root of 645777153 is about 25412.1457771673. The cubic root of 645777153 is about 864.3591332689.

The spelling of 645777153 in words is "six hundred forty-five million, seven hundred seventy-seven thousand, one hundred fifty-three".