19640941541 has 24 divisors (see below), whose sum is σ = 21542022144. Its totient is φ = 17897967360.

The previous prime is 19640941499. The next prime is 19640941543. The reversal of 19640941541 is 14514904691.

It is not a de Polignac number, because 19640941541 - 2⁶ = 19640941477 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 19640941492 and 19640941501.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19640941543) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4526525 + ... + 4530861.

It is an arithmetic number, because the mean of its divisors is an integer number (897584256).

Almost surely, 2^19640941541 is an apocalyptic number.

It is an amenable number.

19640941541 is a deficient number, since it is larger than the sum of its proper divisors (1901080603).

19640941541 is a wasteful number, since it uses less digits than its factorization.

19640941541 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4701 (or 4688 counting only the distinct ones).

The product of its (nonzero) digits is 155520, while the sum is 44.

The spelling of 19640941541 in words is "nineteen billion, six hundred forty million, nine hundred forty-one thousand, five hundred forty-one".