19436123156 has 6 divisors (see below), whose sum is σ = 34013215530. Its totient is φ = 9718061576.

The previous prime is 19436123153. The next prime is 19436123173. The reversal of 19436123156 is 65132163491.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 13943831056 + 5492292100 = 118084^2 + 74110^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19436123153) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2429515391 + ... + 2429515398.

It is an arithmetic number, because the mean of its divisors is an integer number (5668869255).

Almost surely, 2^19436123156 is an apocalyptic number.

It is an amenable number.

19436123156 is a deficient number, since it is larger than the sum of its proper divisors (14577092374).

19436123156 is a wasteful number, since it uses less digits than its factorization.

19436123156 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4859030793 (or 4859030791 counting only the distinct ones).

The product of its digits is 116640, while the sum is 41.

The spelling of 19436123156 in words is "nineteen billion, four hundred thirty-six million, one hundred twenty-three thousand, one hundred fifty-six".