645540646125 has 32 divisors (see below), whose sum is σ = 1075920992640. Its totient is φ = 343730217600.

The previous prime is 645540646109. The next prime is 645540646133. The reversal of 645540646125 is 521646045546.

It is a happy number.

645540646125 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 645540646125 - 2⁴ = 645540646109 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1163635 + ... + 1626384.

It is an arithmetic number, because the mean of its divisors is an integer number (33622531020).

Almost surely, 2^645540646125 is an apocalyptic number.

It is an amenable number.

645540646125 is a deficient number, since it is larger than the sum of its proper divisors (430380346515).

645540646125 is a wasteful number, since it uses less digits than its factorization.

645540646125 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2790654 (or 2790644 counting only the distinct ones).

The product of its (nonzero) digits is 3456000, while the sum is 48.

The spelling of 645540646125 in words is "six hundred forty-five billion, five hundred forty million, six hundred forty-six thousand, one hundred twenty-five".