19426965964840 has 96 divisors (see below), whose sum is σ = 50855260682880. Its totient is φ = 6659606341248.

The previous prime is 19426965964823. The next prime is 19426965964843. The reversal of 19426965964840 is 4846956962491.

It is not an unprimeable number, because it can be changed into a prime (19426965964843) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 11484189 + ... + 13066771.

It is an arithmetic number, because the mean of its divisors is an integer number (529742298780).

Almost surely, 2^{19426965964840} is an apocalyptic number.

19426965964840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

19426965964840 is an abundant number, since it is smaller than the sum of its proper divisors (31428294718040).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

19426965964840 is a wasteful number, since it uses less digits than its factorization.

19426965964840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1588871 (or 1588860 counting only the distinct ones).

The product of its (nonzero) digits is 806215680, while the sum is 73.

The spelling of 19426965964840 in words is "nineteen trillion, four hundred twenty-six billion, nine hundred sixty-five million, nine hundred sixty-four thousand, eight hundred forty".