645262501560 has 32 divisors (see below), whose sum is σ = 1935787505040. Its totient is φ = 172070000384.

The previous prime is 645262501547. The next prime is 645262501561. The reversal of 645262501560 is 65105262546.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645262501561) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2688593637 + ... + 2688593876.

Almost surely, 2^645262501560 is an apocalyptic number.

645262501560 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

645262501560 is an abundant number, since it is smaller than the sum of its proper divisors (1290525003480).

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

645262501560 is a wasteful number, since it uses less digits than its factorization.

645262501560 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5377187527 (or 5377187523 counting only the distinct ones).

The product of its (nonzero) digits is 432000, while the sum is 42.

The spelling of 645262501560 in words is "six hundred forty-five billion, two hundred sixty-two million, five hundred one thousand, five hundred sixty".