19550116501 has 4 divisors (see below), whose sum is σ = 20700123372. Its totient is φ = 18400109632.

The previous prime is 19550116477. The next prime is 19550116507. The reversal of 19550116501 is 10561105591.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 10561105591 = 1709 ⋅6179699.

It can be written as a sum of positive squares in 2 ways, for example, as 11626446276 + 7923670225 = 107826^2 + 89015^2 .

It is a cyclic number.

It is not a de Polignac number, because 19550116501 - 2⁷ = 19550116373 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19550116507) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 575003410 + ... + 575003443.

It is an arithmetic number, because the mean of its divisors is an integer number (5175030843).

Almost surely, 2^19550116501 is an apocalyptic number.

It is an amenable number.

19550116501 is a deficient number, since it is larger than the sum of its proper divisors (1150006871).

19550116501 is a wasteful number, since it uses less digits than its factorization.

19550116501 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1150006870.

The product of its (nonzero) digits is 6750, while the sum is 34.

The spelling of 19550116501 in words is "nineteen billion, five hundred fifty million, one hundred sixteen thousand, five hundred one".