19657863950 has 24 divisors (see below), whose sum is σ = 36567328440. Its totient is φ = 7862349600.

The previous prime is 19657863943. The next prime is 19657863971. The reversal of 19657863950 is 5936875691.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 19657863950.

It is a congruent number.

It is an unprimeable number.

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 in 11 ways as a sum of consecutive naturals, for example, 899756 + ... + 921344.

It is an arithmetic number, because the mean of its divisors is an integer number (1523638685).

Almost surely, 2^19657863950 is an apocalyptic number.

19657863950 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

19657863950 is a deficient number, since it is larger than the sum of its proper divisors (16909464490).

19657863950 is a wasteful number, since it uses less digits than its factorization.

19657863950 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39812 (or 39807 counting only the distinct ones).

The product of its (nonzero) digits is 12247200, while the sum is 59.

The spelling of 19657863950 in words is "nineteen billion, six hundred fifty-seven million, eight hundred sixty-three thousand, nine hundred fifty".