642931198663744 has 63 divisors (see below), whose sum is σ = 1294067921523573. Its totient is φ = 316930815129600.

The previous prime is 642931198663657. The next prime is 642931198663751. The reversal of 642931198663744 is 447366891139246.

The square root of 642931198663744 is 25356088.

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

It can be written as a sum of positive squares in only one way, i.e., 480472722017344 + 162458476646400 = 21919688^2 + 12745920^2 .

It is a super-2 number, since 2×642931198663744² (a number of 30 digits) contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 14402235664 + ... + 14402280304.

Almost surely, 2^{642931198663744} is an apocalyptic number.

642931198663744 is a gapful number since it is divisible by the number (64) formed by its first and last digit.

642931198663744 is the 25356088-th square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 642931198663744

642931198663744 is an abundant number, since it is smaller than the sum of its proper divisors (651136722859829).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

642931198663744 is an frugal number, since it uses more digits than its factorization.

642931198663744 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 89436 (or 44714 counting only the distinct ones).

The product of its digits is 1128701952, while the sum is 73.

The spelling of 642931198663744 in words is "six hundred forty-two trillion, nine hundred thirty-one billion, one hundred ninety-eight million, six hundred sixty-three thousand, seven hundred forty-four".