19540977879 has 8 divisors (see below), whose sum is σ = 27587262960. Its totient is φ = 12261005696.

The previous prime is 19540977877. The next prime is 19540977893. The reversal of 19540977879 is 97877904591.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 19540977879 - 2¹ = 19540977877 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19540977877) 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 7 ways as a sum of consecutive naturals, for example, 191578164 + ... + 191578265.

It is an arithmetic number, because the mean of its divisors is an integer number (3448407870).

Almost surely, 2^19540977879 is an apocalyptic number.

19540977879 is a deficient number, since it is larger than the sum of its proper divisors (8046285081).

19540977879 is a wasteful number, since it uses less digits than its factorization.

19540977879 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 383156449.

The product of its (nonzero) digits is 40007520, while the sum is 66.

The spelling of 19540977879 in words is "nineteen billion, five hundred forty million, nine hundred seventy-seven thousand, eight hundred seventy-nine".