642430160621 has 8 divisors (see below), whose sum is σ = 643007886840. Its totient is φ = 641852563968.

The previous prime is 642430160573. The next prime is 642430160629. The reversal of 642430160621 is 126061034246.

It can be written as a sum of positive squares in 4 ways, for example, as 291475813225 + 350954347396 = 539885^2 + 592414^2 .

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 642430160621 - 2²² = 642425966317 is a prime.

It is a super-2 number, since 2×642430160621² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642430160629) 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, 11787185 + ... + 11841561.

It is an arithmetic number, because the mean of its divisors is an integer number (80375985855).

Almost surely, 2^642430160621 is an apocalyptic number.

It is an amenable number.

642430160621 is a deficient number, since it is larger than the sum of its proper divisors (577726219).

642430160621 is a wasteful number, since it uses less digits than its factorization.

642430160621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64783.

The product of its (nonzero) digits is 41472, while the sum is 35.

Adding to 642430160621 its reverse (126061034246), we get a palindrome (768491194867).

The spelling of 642430160621 in words is "six hundred forty-two billion, four hundred thirty million, one hundred sixty thousand, six hundred twenty-one".