1642691407904 has 12 divisors (see below), whose sum is σ = 3234048709374. Its totient is φ = 821345703936.

The previous prime is 1642691407867. The next prime is 1642691407909. The reversal of 1642691407904 is 4097041962461.

It can be written as a sum of positive squares in only one way, i.e., 1365859690000 + 276831717904 = 1168700^2 + 526148^2 .

It is a Smith number, since the sum of its digits (53) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (1642691407909) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25667053217 + ... + 25667053280.

Almost surely, 2^{1642691407904} is an apocalyptic number.

It is an amenable number.

1642691407904 is a deficient number, since it is larger than the sum of its proper divisors (1591357301470).

1642691407904 is an equidigital number, since it uses as much as digits as its factorization.

1642691407904 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51334106507 (or 51334106499 counting only the distinct ones).

The product of its (nonzero) digits is 2612736, while the sum is 53.

The spelling of 1642691407904 in words is "one trillion, six hundred forty-two billion, six hundred ninety-one million, four hundred seven thousand, nine hundred four".