19461248639 has 8 divisors (see below), whose sum is σ = 22300114560. Its totient is φ = 16637054616.

The previous prime is 19461248633. The next prime is 19461248657. The reversal of 19461248639 is 93684216491.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 19461248639 - 2⁴ = 19461248623 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19461248633) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3665129 + ... + 3670434.

It is an arithmetic number, because the mean of its divisors is an integer number (2787514320).

Almost surely, 2^19461248639 is an apocalyptic number.

19461248639 is a deficient number, since it is larger than the sum of its proper divisors (2838865921).

19461248639 is an equidigital number, since it uses as much as digits as its factorization.

19461248639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7335949.

The product of its digits is 2239488, while the sum is 53.

The spelling of 19461248639 in words is "nineteen billion, four hundred sixty-one million, two hundred forty-eight thousand, six hundred thirty-nine".