1997642533954 has 8 divisors (see below), whose sum is σ = 2996473525308. Its totient is φ = 998818025520.

The previous prime is 1997642533951. The next prime is 1997642534011. The reversal of 1997642533954 is 4593352467991.

It can be written as a sum of positive squares in 2 ways, for example, as 1643947087225 + 353695446729 = 1282165^2 + 594723^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 1997642533954.

It is not an unprimeable number, because it can be changed into a prime (1997642533951) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 758677 + ... + 2137960.

Almost surely, 2^{1997642533954} is an apocalyptic number.

1997642533954 is a deficient number, since it is larger than the sum of its proper divisors (998830991354).

1997642533954 is a wasteful number, since it uses less digits than its factorization.

1997642533954 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3241460.

The product of its digits is 220449600, while the sum is 67.

The spelling of 1997642533954 in words is "one trillion, nine hundred ninety-seven billion, six hundred forty-two million, five hundred thirty-three thousand, nine hundred fifty-four".