19558770780 has 24 divisors (see below), whose sum is σ = 54764558352. Its totient is φ = 5215672192.

The previous prime is 19558770761. The next prime is 19558770787. The reversal of 19558770780 is 8707785591.

It is a self number, because there is not a number n which added to its sum of digits gives 19558770780.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19558770787) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 162989697 + ... + 162989816.

It is an arithmetic number, because the mean of its divisors is an integer number (2281856598).

Almost surely, 2^19558770780 is an apocalyptic number.

19558770780 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

19558770780 is an abundant number, since it is smaller than the sum of its proper divisors (35205787572).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

19558770780 is a wasteful number, since it uses less digits than its factorization.

19558770780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 325979525 (or 325979523 counting only the distinct ones).

The product of its (nonzero) digits is 4939200, while the sum is 57.

The spelling of 19558770780 in words is "nineteen billion, five hundred fifty-eight million, seven hundred seventy thousand, seven hundred eighty".