19890952842664 has 64 divisors (see below), whose sum is σ = 39053443136400. Its totient is φ = 9489057030144.

The previous prime is 19890952842653. The next prime is 19890952842689. The reversal of 19890952842664 is 46624825909891.

It can be written as a sum of positive squares in 8 ways, for example, as 9680001012900 + 10210951829764 = 3111270^2 + 3195458^2 .

It is a super-3 number, since 3×19890952842664³ (a number of 41 digits) contains 333 as substring.

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, 48259 + ... + 6307474.

Almost surely, 2^{19890952842664} is an apocalyptic number.

It is an amenable number.

19890952842664 is a deficient number, since it is larger than the sum of its proper divisors (19162490293736).

19890952842664 is a wasteful number, since it uses less digits than its factorization.

19890952842664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6355982 (or 6355978 counting only the distinct ones).

The product of its (nonzero) digits is 537477120, while the sum is 73.

The spelling of 19890952842664 in words is "nineteen trillion, eight hundred ninety billion, nine hundred fifty-two million, eight hundred forty-two thousand, six hundred sixty-four".