19649441973 has 16 divisors (see below), whose sum is σ = 30008707200. Its totient is φ = 11203239936.

The previous prime is 19649441969. The next prime is 19649442013. The reversal of 19649441973 is 37914494691.

It is not a de Polignac number, because 19649441973 - 2² = 19649441969 is a prime.

It is a super-2 number, since 2×19649441973² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19649441953) 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, 1032540 + ... + 1051397.

It is an arithmetic number, because the mean of its divisors is an integer number (1875544200).

Almost surely, 2^19649441973 is an apocalyptic number.

It is an amenable number.

19649441973 is a deficient number, since it is larger than the sum of its proper divisors (10359265227).

19649441973 is a wasteful number, since it uses less digits than its factorization.

19649441973 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2084396.

The product of its digits is 5878656, while the sum is 57.

The spelling of 19649441973 in words is "nineteen billion, six hundred forty-nine million, four hundred forty-one thousand, nine hundred seventy-three".