642229137664 has 27 divisors (see below), whose sum is σ = 1281975162727. Its totient is φ = 321108157696.

The previous prime is 642229137623. The next prime is 642229137689. The reversal of 642229137664 is 466731922246.

The square root of 642229137664 is 801392.

It is a perfect power (a square), and thus also a powerful number.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 12797229 + ... + 12847315.

Almost surely, 2^642229137664 is an apocalyptic number.

642229137664 is a gapful number since it is divisible by the number (64) formed by its first and last digit.

642229137664 is the 801392-nd square number.

It is an amenable number.

642229137664 is a deficient number, since it is larger than the sum of its proper divisors (639746025063).

642229137664 is an frugal number, since it uses more digits than its factorization.

642229137664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 100190 (or 50089 counting only the distinct ones).

The product of its digits is 5225472, while the sum is 52.

The spelling of 642229137664 in words is "six hundred forty-two billion, two hundred twenty-nine million, one hundred thirty-seven thousand, six hundred sixty-four".