645540646127 has 8 divisors (see below), whose sum is σ = 697462110576. Its totient is φ = 593942680512.

The previous prime is 645540646109. The next prime is 645540646133. The reversal of 645540646127 is 721646045546.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 645540646127 - 2²² = 645536451823 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645540646627) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 80870558 + ... + 80878539.

It is an arithmetic number, because the mean of its divisors is an integer number (87182763822).

Almost surely, 2^645540646127 is an apocalyptic number.

645540646127 is a deficient number, since it is larger than the sum of its proper divisors (51921464449).

645540646127 is a wasteful number, since it uses less digits than its factorization.

645540646127 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 161749417.

The product of its (nonzero) digits is 4838400, while the sum is 50.

The spelling of 645540646127 in words is "six hundred forty-five billion, five hundred forty million, six hundred forty-six thousand, one hundred twenty-seven".