1642101252466 has 4 divisors (see below), whose sum is σ = 2463151878702. Its totient is φ = 821050626232.

The previous prime is 1642101252461. The next prime is 1642101252497. The reversal of 1642101252466 is 6642521012461.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 1048463363025 + 593637889441 = 1023945^2 + 770479^2 .

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (1642101252461) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 410525313115 + ... + 410525313118.

Almost surely, 2^{1642101252466} is an apocalyptic number.

1642101252466 is a deficient number, since it is larger than the sum of its proper divisors (821050626236).

1642101252466 is an equidigital number, since it uses as much as digits as its factorization.

1642101252466 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 821050626235.

The product of its (nonzero) digits is 138240, while the sum is 40.

The spelling of 1642101252466 in words is "one trillion, six hundred forty-two billion, one hundred one million, two hundred fifty-two thousand, four hundred sixty-six".