619889891634 has 96 divisors (see below), whose sum is σ = 1460636377200. Its totient is φ = 188861621760.

The previous prime is 619889891633. The next prime is 619889891651. The reversal of 619889891634 is 436198988916.

It can be written as a sum of positive squares in 8 ways, for example, as 207922320225 + 411967571409 = 455985^2 + 641847^2 .

It is not an unprimeable number, because it can be changed into a prime (619889891633) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 43582644 + ... + 43596864.

Almost surely, 2^619889891634 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 619889891634, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (730318188600).

619889891634 is an abundant number, since it is smaller than the sum of its proper divisors (840746485566).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

619889891634 is a wasteful number, since it uses less digits than its factorization.

619889891634 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16060 (or 16057 counting only the distinct ones).

The product of its digits is 161243136, while the sum is 72.

The spelling of 619889891634 in words is "six hundred nineteen billion, eight hundred eighty-nine million, eight hundred ninety-one thousand, six hundred thirty-four".