1951591634616 has 128 divisors (see below), whose sum is σ = 5354435016000. Its totient is φ = 589048332288.

The previous prime is 1951591634557. The next prime is 1951591634689. The reversal of 1951591634616 is 6164361951591.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 142351570 + ... + 142365278.

Almost surely, 2^{1951591634616} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1951591634616, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2677217508000).

1951591634616 is an abundant number, since it is smaller than the sum of its proper divisors (3402843381384).

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

1951591634616 is a wasteful number, since it uses less digits than its factorization.

1951591634616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22393 (or 22389 counting only the distinct ones).

The product of its digits is 5248800, while the sum is 57.

The spelling of 1951591634616 in words is "one trillion, nine hundred fifty-one billion, five hundred ninety-one million, six hundred thirty-four thousand, six hundred sixteen".