19955659550 has 48 divisors (see below), whose sum is σ = 38151820032. Its totient is φ = 7760188800.

The previous prime is 19955659531. The next prime is 19955659561. The reversal of 19955659550 is 5595655991.

It is a self number, because there is not a number n which added to its sum of digits gives 19955659550.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2717684 + ... + 2725016.

It is an arithmetic number, because the mean of its divisors is an integer number (794829584).

Almost surely, 2^19955659550 is an apocalyptic number.

19955659550 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

19955659550 is a deficient number, since it is larger than the sum of its proper divisors (18196160482).

19955659550 is a wasteful number, since it uses less digits than its factorization.

19955659550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8853 (or 8848 counting only the distinct ones).

The product of its (nonzero) digits is 13668750, while the sum is 59.

The spelling of 19955659550 in words is "nineteen billion, nine hundred fifty-five million, six hundred fifty-nine thousand, five hundred fifty".