642015563767 has 4 divisors (see below), whose sum is σ = 646701808896. Its totient is φ = 637329318640.

The previous prime is 642015563753. The next prime is 642015563843. The reversal of 642015563767 is 767365510246.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-642015563767 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 (642015563867) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2343122359 + ... + 2343122632.

It is an arithmetic number, because the mean of its divisors is an integer number (161675452224).

Almost surely, 2^642015563767 is an apocalyptic number.

642015563767 is a deficient number, since it is larger than the sum of its proper divisors (4686245129).

642015563767 is a wasteful number, since it uses less digits than its factorization.

642015563767 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4686245128.

The product of its (nonzero) digits is 6350400, while the sum is 52.

The spelling of 642015563767 in words is "six hundred forty-two billion, fifteen million, five hundred sixty-three thousand, seven hundred sixty-seven".