642516461 has 8 divisors (see below), whose sum is σ = 656570880. Its totient is φ = 628478128.

The previous prime is 642516451. The next prime is 642516467. The reversal of 642516461 is 164615246.

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 642516461 - 2⁶ = 642516397 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642516467) 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, 113660 + ... + 119178.

It is an arithmetic number, because the mean of its divisors is an integer number (82071360).

Almost surely, 2^642516461 is an apocalyptic number.

It is an amenable number.

642516461 is a deficient number, since it is larger than the sum of its proper divisors (14054419).

642516461 is a wasteful number, since it uses less digits than its factorization.

642516461 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8043.

The product of its digits is 34560, while the sum is 35.

The square root of 642516461 is about 25347.9084146996. The cubic root of 642516461 is about 862.9018886302.

The spelling of 642516461 in words is "six hundred forty-two million, five hundred sixteen thousand, four hundred sixty-one".