1639863792428 has 6 divisors (see below), whose sum is σ = 2869761636756. Its totient is φ = 819931896212.

The previous prime is 1639863792419. The next prime is 1639863792433. The reversal of 1639863792428 is 8242973689361.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 204982974050 + ... + 204982974057.

It is an arithmetic number, because the mean of its divisors is an integer number (478293606126).

Almost surely, 2^{1639863792428} is an apocalyptic number.

It is an amenable number.

1639863792428 is a deficient number, since it is larger than the sum of its proper divisors (1229897844328).

1639863792428 is a wasteful number, since it uses less digits than its factorization.

1639863792428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 409965948111 (or 409965948109 counting only the distinct ones).

The product of its digits is 188116992, while the sum is 68.

The spelling of 1639863792428 in words is "one trillion, six hundred thirty-nine billion, eight hundred sixty-three million, seven hundred ninety-two thousand, four hundred twenty-eight".