1997633016 has 96 divisors (see below), whose sum is σ = 5627381760. Its totient is φ = 663891552.

The previous prime is 1997633003. The next prime is 1997633021. The reversal of 1997633016 is 6103367991.

1997633016 is a `hidden beast` number, since 1 + 9 + 9 + 7 + 633 + 0 + 1 + 6 = 666.

It is a super-2 number, since 2×1997633016² = 7981075333226512512, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 743211 + ... + 745893.

It is an arithmetic number, because the mean of its divisors is an integer number (58618560).

Almost surely, 2^1997633016 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 1997633016, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2813690880).

1997633016 is an abundant number, since it is smaller than the sum of its proper divisors (3629748744).

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

1997633016 is a wasteful number, since it uses less digits than its factorization.

1997633016 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3087 (or 3071 counting only the distinct ones).

The product of its (nonzero) digits is 183708, while the sum is 45.

The square root of 1997633016 is about 44694.8880298407. Note that the first 3 decimals coincide. The cubic root of 1997633016 is about 1259.4238181923.

The spelling of 1997633016 in words is "one billion, nine hundred ninety-seven million, six hundred thirty-three thousand, sixteen".