19946156011 has 4 divisors (see below), whose sum is σ = 20132568792. Its totient is φ = 19759743232.

The previous prime is 19946155991. The next prime is 19946156047. The reversal of 19946156011 is 11065164991.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 19946156011 - 2¹⁵ = 19946123243 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19946156081) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 93206230 + ... + 93206443.

It is an arithmetic number, because the mean of its divisors is an integer number (5033142198).

Almost surely, 2^19946156011 is an apocalyptic number.

19946156011 is a deficient number, since it is larger than the sum of its proper divisors (186412781).

19946156011 is a wasteful number, since it uses less digits than its factorization.

19946156011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 186412780.

The product of its (nonzero) digits is 58320, while the sum is 43.

The spelling of 19946156011 in words is "nineteen billion, nine hundred forty-six million, one hundred fifty-six thousand, eleven".