1642636975716 has 135 divisors (see below), whose sum is σ = 4720775674153. Its totient is φ = 497691881280.

The previous prime is 1642636975703. The next prime is 1642636975741. The reversal of 1642636975716 is 6175796362461.

It is a happy number.

The square root of 1642636975716 is 1281654.

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

1642636975716 is a `hidden beast` number, since 1 + 6 + 4 + 26 + 36 + 9 + 7 + 571 + 6 = 666.

It can be written as a sum of positive squares in only one way, i.e., 301895302500 + 1340741673216 = 549450^2 + 1157904^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 44 ways as a sum of consecutive naturals, for example, 253764256 + ... + 253770728.

Almost surely, 2^{1642636975716} is an apocalyptic number.

1642636975716 is the 1281654-th square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1642636975716

1642636975716 is an abundant number, since it is smaller than the sum of its proper divisors (3078138698437).

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

1642636975716 is an frugal number, since it uses more digits than its factorization.

1642636975716 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12984 (or 6489 counting only the distinct ones).

The product of its digits is 68584320, while the sum is 63.

The spelling of 1642636975716 in words is "one trillion, six hundred forty-two billion, six hundred thirty-six million, nine hundred seventy-five thousand, seven hundred sixteen".