1642639395412 has 6 divisors (see below), whose sum is σ = 2874618941978. Its totient is φ = 821319697704.

The previous prime is 1642639395347. The next prime is 1642639395431. The reversal of 1642639395412 is 2145939362461.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 1403717865796 + 238921529616 = 1184786^2 + 488796^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 205329924423 + ... + 205329924430.

Almost surely, 2^{1642639395412} is an apocalyptic number.

It is an amenable number.

1642639395412 is a deficient number, since it is larger than the sum of its proper divisors (1231979546566).

1642639395412 is a wasteful number, since it uses less digits than its factorization.

1642639395412 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 410659848857 (or 410659848855 counting only the distinct ones).

The product of its digits is 8398080, while the sum is 55.

The spelling of 1642639395412 in words is "one trillion, six hundred forty-two billion, six hundred thirty-nine million, three hundred ninety-five thousand, four hundred twelve".