19949729605 has 16 divisors (see below), whose sum is σ = 25844258160. Its totient is φ = 14696068608.

The previous prime is 19949729587. The next prime is 19949729621. The reversal of 19949729605 is 50692794991.

It can be written as a sum of positive squares in 8 ways, for example, as 73805281 + 19875924324 = 8591^2 + 140982^2 .

It is not a de Polignac number, because 19949729605 - 2⁷ = 19949729477 is a prime.

It is a super-2 number, since 2×19949729605² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 348622 + ... + 401791.

It is an arithmetic number, because the mean of its divisors is an integer number (1615266135).

Almost surely, 2^19949729605 is an apocalyptic number.

It is an amenable number.

19949729605 is a deficient number, since it is larger than the sum of its proper divisors (5894528555).

19949729605 is a wasteful number, since it uses less digits than its factorization.

19949729605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 750840.

The product of its (nonzero) digits is 11022480, while the sum is 61.

The spelling of 19949729605 in words is "nineteen billion, nine hundred forty-nine million, seven hundred twenty-nine thousand, six hundred five".