19941729537 has 16 divisors (see below), whose sum is σ = 27915245568. Its totient is φ = 12638442960.

The previous prime is 19941729517. The next prime is 19941729541. The reversal of 19941729537 is 73592714991.

It is a happy number.

It is a de Polignac number, because none of the positive numbers 2^k-19941729537 is a prime.

It is not an unprimeable number, because it can be changed into a prime (19941729517) 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, 875289 + ... + 897782.

It is an arithmetic number, because the mean of its divisors is an integer number (1744702848).

Almost surely, 2^19941729537 is an apocalyptic number.

It is an amenable number.

19941729537 is a deficient number, since it is larger than the sum of its proper divisors (7973516031).

19941729537 is a wasteful number, since it uses less digits than its factorization.

19941729537 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1773260.

The product of its digits is 4286520, while the sum is 57.

The spelling of 19941729537 in words is "nineteen billion, nine hundred forty-one million, seven hundred twenty-nine thousand, five hundred thirty-seven".