19716491641 has 32 divisors (see below), whose sum is σ = 25679794176. Its totient is φ = 14678664000.

The previous prime is 19716491621. The next prime is 19716491657. The reversal of 19716491641 is 14619461791.

It is a happy number.

It is not a de Polignac number, because 19716491641 - 2²⁹ = 19179620729 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19716491611) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1660596 + ... + 1672426.

It is an arithmetic number, because the mean of its divisors is an integer number (802493568).

Almost surely, 2^19716491641 is an apocalyptic number.

19716491641 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

19716491641 is a deficient number, since it is larger than the sum of its proper divisors (5963302535).

19716491641 is a wasteful number, since it uses less digits than its factorization.

19716491641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12813.

The product of its digits is 326592, while the sum is 49.

The spelling of 19716491641 in words is "nineteen billion, seven hundred sixteen million, four hundred ninety-one thousand, six hundred forty-one".