1629449731918 has 8 divisors (see below), whose sum is σ = 2523018939840. Its totient is φ = 788443418640.

The previous prime is 1629449731901. The next prime is 1629449731969. The reversal of 1629449731918 is 8191379449261.

It is a happy number.

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

It is a self number, because there is not a number n which added to its sum of digits gives 1629449731918.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13140723583 + ... + 13140723706.

It is an arithmetic number, because the mean of its divisors is an integer number (315377367480).

Almost surely, 2^{1629449731918} is an apocalyptic number.

1629449731918 is a deficient number, since it is larger than the sum of its proper divisors (893569207922).

1629449731918 is a wasteful number, since it uses less digits than its factorization.

1629449731918 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26281447322.

The product of its digits is 23514624, while the sum is 64.

The spelling of 1629449731918 in words is "one trillion, six hundred twenty-nine billion, four hundred forty-nine million, seven hundred thirty-one thousand, nine hundred eighteen".