19746657745 has 16 divisors (see below), whose sum is σ = 24057710208. Its totient is φ = 15556337280.

The previous prime is 19746657743. The next prime is 19746657767. The reversal of 19746657745 is 54775664791.

It is a happy number.

It is not a de Polignac number, because 19746657745 - 2¹ = 19746657743 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19746657743) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1221757 + ... + 1237813.

It is an arithmetic number, because the mean of its divisors is an integer number (1503606888).

Almost surely, 2^19746657745 is an apocalyptic number.

It is an amenable number.

19746657745 is a deficient number, since it is larger than the sum of its proper divisors (4311052463).

19746657745 is a wasteful number, since it uses less digits than its factorization.

19746657745 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19800.

The product of its digits is 44452800, while the sum is 61.

The spelling of 19746657745 in words is "nineteen billion, seven hundred forty-six million, six hundred fifty-seven thousand, seven hundred forty-five".