642515066171 has 8 divisors (see below), whose sum is σ = 701715757824. Its totient is φ = 583446079720.

The previous prime is 642515066159. The next prime is 642515066197. The reversal of 642515066171 is 171660515246.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-642515066171 is a prime.

It is a super-2 number, since 2×642515066171² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (642515066071) 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, 32916095 + ... + 32935608.

It is an arithmetic number, because the mean of its divisors is an integer number (87714469728).

Almost surely, 2^642515066171 is an apocalyptic number.

642515066171 is a deficient number, since it is larger than the sum of its proper divisors (59200691653).

642515066171 is a wasteful number, since it uses less digits than its factorization.

642515066171 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65852601.

The product of its (nonzero) digits is 302400, while the sum is 44.

The spelling of 642515066171 in words is "six hundred forty-two billion, five hundred fifteen million, sixty-six thousand, one hundred seventy-one".