1642670298889 has 3 divisors (see below), whose sum is σ = 1642671580557. Its totient is φ = 1642669017222.

The previous prime is 1642670298859. The next prime is 1642670298947. The reversal of 1642670298889 is 9888920762461.

The square root of 1642670298889 is 1281667.

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

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is not a de Polignac number, because 1642670298889 - 2¹³ = 1642670290697 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1642670298809) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 640834 + ... + 1922500.

It is an arithmetic number, because the mean of its divisors is an integer number (547557193519).

Almost surely, 2^{1642670298889} is an apocalyptic number.

1642670298889 is the 1281667-th square number.

1642670298889 is the 640834-th centered octagonal number.

It is an amenable number.

1642670298889 is a deficient number, since it is larger than the sum of its proper divisors (1281668).

1642670298889 is an frugal number, since it uses more digits than its factorization.

1642670298889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2563334 (or 1281667 counting only the distinct ones).

The product of its (nonzero) digits is 167215104, while the sum is 70.

The spelling of 1642670298889 in words is "one trillion, six hundred forty-two billion, six hundred seventy million, two hundred ninety-eight thousand, eight hundred eighty-nine".