19855269949 has 32 divisors (see below), whose sum is σ = 21572812800. Its totient is φ = 18230546880.

The previous prime is 19855269947. The next prime is 19855269953. The reversal of 19855269949 is 94996255891.

It is a cyclic number.

It is not a de Polignac number, because 19855269949 - 2¹ = 19855269947 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19855269943) 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, 18677992 + ... + 18679054.

It is an arithmetic number, because the mean of its divisors is an integer number (674150400).

Almost surely, 2^19855269949 is an apocalyptic number.

It is an amenable number.

19855269949 is a deficient number, since it is larger than the sum of its proper divisors (1717542851).

19855269949 is a wasteful number, since it uses less digits than its factorization.

19855269949 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1465.

The product of its digits is 62985600, while the sum is 67.

The spelling of 19855269949 in words is "nineteen billion, eight hundred fifty-five million, two hundred sixty-nine thousand, nine hundred forty-nine".