19740259981 has 16 divisors (see below), whose sum is σ = 21351371328. Its totient is φ = 18142560000.

The previous prime is 19740259967. The next prime is 19740259999. The reversal of 19740259981 is 18995204791.

It is a cyclic number.

It is not a de Polignac number, because 19740259981 - 2²⁹ = 19203389069 is a prime.

It is a super-2 number, since 2×19740259981² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19740259901) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3056806 + ... + 3063256.

It is an arithmetic number, because the mean of its divisors is an integer number (1334460708).

Almost surely, 2^19740259981 is an apocalyptic number.

It is an amenable number.

19740259981 is a deficient number, since it is larger than the sum of its proper divisors (1611111347).

19740259981 is a wasteful number, since it uses less digits than its factorization.

19740259981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7452.

The product of its (nonzero) digits is 1632960, while the sum is 55.

The spelling of 19740259981 in words is "nineteen billion, seven hundred forty million, two hundred fifty-nine thousand, nine hundred eighty-one".