19739242461 has 16 divisors (see below), whose sum is σ = 26980122816. Its totient is φ = 12831975936.

The previous prime is 19739242451. The next prime is 19739242469. The reversal of 19739242461 is 16424293791.

It is a de Polignac number, because none of the positive numbers 2^k-19739242461 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 19739242461.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19739242469) 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, 354900 + ... + 406733.

It is an arithmetic number, because the mean of its divisors is an integer number (1686257676).

Almost surely, 2^19739242461 is an apocalyptic number.

It is an amenable number.

19739242461 is a deficient number, since it is larger than the sum of its proper divisors (7240880355).

19739242461 is a wasteful number, since it uses less digits than its factorization.

19739242461 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 761852.

The product of its digits is 653184, while the sum is 48.

The spelling of 19739242461 in words is "nineteen billion, seven hundred thirty-nine million, two hundred forty-two thousand, four hundred sixty-one".