642510245045 has 4 divisors (see below), whose sum is σ = 771012294060. Its totient is φ = 514008196032.

The previous prime is 642510244991. The next prime is 642510245059. The reversal of 642510245045 is 540542015246.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 240500987281 + 402009257764 = 490409^2 + 634042^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-642510245045 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 64251024500 + ... + 64251024509.

It is an arithmetic number, because the mean of its divisors is an integer number (192753073515).

Almost surely, 2^642510245045 is an apocalyptic number.

It is an amenable number.

642510245045 is a deficient number, since it is larger than the sum of its proper divisors (128502049015).

642510245045 is a wasteful number, since it uses less digits than its factorization.

642510245045 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128502049014.

The product of its (nonzero) digits is 192000, while the sum is 38.

The spelling of 642510245045 in words is "six hundred forty-two billion, five hundred ten million, two hundred forty-five thousand, forty-five".