19990059551 has 32 divisors (see below), whose sum is σ = 25541568000. Its totient is φ = 15509135040.

The previous prime is 19990059547. The next prime is 19990059563. The reversal of 19990059551 is 15595009991.

It is not a de Polignac number, because 19990059551 - 2² = 19990059547 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 19990059493 and 19990059502.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19990059751) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 867740 + ... + 890478.

It is an arithmetic number, because the mean of its divisors is an integer number (798174000).

Almost surely, 2^19990059551 is an apocalyptic number.

19990059551 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

19990059551 is a deficient number, since it is larger than the sum of its proper divisors (5551508449).

19990059551 is a wasteful number, since it uses less digits than its factorization.

19990059551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23004 (or 22990 counting only the distinct ones).

The product of its (nonzero) digits is 820125, while the sum is 53.

The spelling of 19990059551 in words is "nineteen billion, nine hundred ninety million, fifty-nine thousand, five hundred fifty-one".