642545513 has 8 divisors (see below), whose sum is σ = 653517696. Its totient is φ = 631587600.

The previous prime is 642545483. The next prime is 642545521. The reversal of 642545513 is 315545246.

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 642545513 - 2¹⁶ = 642479977 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (642545573) 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, 127520 + ... + 132462.

It is an arithmetic number, because the mean of its divisors is an integer number (81689712).

Almost surely, 2^642545513 is an apocalyptic number.

It is an amenable number.

642545513 is a deficient number, since it is larger than the sum of its proper divisors (10972183).

642545513 is a wasteful number, since it uses less digits than its factorization.

642545513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7135.

The product of its digits is 72000, while the sum is 35.

The square root of 642545513 is about 25348.4814732559. The cubic root of 642545513 is about 862.9148940806.

The spelling of 642545513 in words is "six hundred forty-two million, five hundred forty-five thousand, five hundred thirteen".