19910930455 has 16 divisors (see below), whose sum is σ = 25769338560. Its totient is φ = 14681576448.

The previous prime is 19910930453. The next prime is 19910930477. The reversal of 19910930455 is 55403901991.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 19910930455 - 2¹ = 19910930453 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19910930453) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 183835 + ... + 271324.

It is an arithmetic number, because the mean of its divisors is an integer number (1610583660).

Almost surely, 2^19910930455 is an apocalyptic number.

19910930455 is a deficient number, since it is larger than the sum of its proper divisors (5858408105).

19910930455 is a wasteful number, since it uses less digits than its factorization.

19910930455 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 455850.

The product of its (nonzero) digits is 218700, while the sum is 46.

The spelling of 19910930455 in words is "nineteen billion, nine hundred ten million, nine hundred thirty thousand, four hundred fifty-five".