642515515 has 8 divisors (see below), whose sum is σ = 771186240. Its totient is φ = 513900672.

The previous prime is 642515513. The next prime is 642515537. The reversal of 642515515 is 515515246.

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 642515515 - 2¹ = 642515513 is a prime.

It is not an unprimeable number, because it can be changed into a prime (642515513) 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, 17971 + ... + 40099.

It is an arithmetic number, because the mean of its divisors is an integer number (96398280).

Almost surely, 2^642515515 is an apocalyptic number.

642515515 is a deficient number, since it is larger than the sum of its proper divisors (128670725).

642515515 is a wasteful number, since it uses less digits than its factorization.

642515515 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27941.

The product of its digits is 30000, while the sum is 34.

The square root of 642515515 is about 25347.8897543760. The cubic root of 642515515 is about 862.9014651362.

The spelling of 642515515 in words is "six hundred forty-two million, five hundred fifteen thousand, five hundred fifteen".