19540042766 has 16 divisors (see below), whose sum is σ = 29673955584. Its totient is φ = 9648809784.

The previous prime is 19540042763. The next prime is 19540042783. The reversal of 19540042766 is 66724004591.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19540042763) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 471995 + ... + 511721.

It is an arithmetic number, because the mean of its divisors is an integer number (1854622224).

Almost surely, 2^19540042766 is an apocalyptic number.

19540042766 is a deficient number, since it is larger than the sum of its proper divisors (10133912818).

19540042766 is a wasteful number, since it uses less digits than its factorization.

19540042766 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42775.

The product of its (nonzero) digits is 362880, while the sum is 44.

The spelling of 19540042766 in words is "nineteen billion, five hundred forty million, forty-two thousand, seven hundred sixty-six".