19000000061 has 8 divisors (see below), whose sum is σ = 21716137344. Its totient is φ = 16284325680.

The previous prime is 19000000049. The next prime is 19000000079. The reversal of 19000000061 is 16000000091.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 19000000061 - 2¹⁰ = 18999999037 is a prime.

It is a super-2 number, since 2×19000000061² (a number of 21 digits) contains 22 as substring.

19000000061 is a strobogrammatic number because it is the same when read upside-down.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 18999999976 and 19000000039.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19000000031) 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, 22790 + ... + 196263.

It is an arithmetic number, because the mean of its divisors is an integer number (2714517168).

Almost surely, 2^19000000061 is an apocalyptic number.

It is an amenable number.

19000000061 is a deficient number, since it is larger than the sum of its proper divisors (2716137283).

19000000061 is a wasteful number, since it uses less digits than its factorization.

19000000061 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 231451.

The product of its (nonzero) digits is 54, while the sum is 17.

The spelling of 19000000061 in words is "nineteen billion, sixty-one", and thus it is an aban number and an uban number.