19401570941840 has 20 divisors (see below), whose sum is σ = 45108652439964. Its totient is φ = 7760628376704.

The previous prime is 19401570941839. The next prime is 19401570941843. The reversal of 19401570941840 is 4814907510491.

It can be written as a sum of positive squares in 2 ways, for example, as 8194181052304 + 11207389889536 = 2862548^2 + 3347744^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a super-2 number, since 2×19401570941840² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (19401570941843) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 121259818307 + ... + 121259818466.

Almost surely, 2^{19401570941840} is an apocalyptic number.

19401570941840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

19401570941840 is an abundant number, since it is smaller than the sum of its proper divisors (25707081498124).

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

19401570941840 is a wasteful number, since it uses less digits than its factorization.

19401570941840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 242519636786 (or 242519636780 counting only the distinct ones).

The product of its (nonzero) digits is 1451520, while the sum is 53.

The spelling of 19401570941840 in words is "nineteen trillion, four hundred one billion, five hundred seventy million, nine hundred forty-one thousand, eight hundred forty".