1995661854 has 64 divisors (see below), whose sum is σ = 4617518400. Its totient is φ = 638112384.

The previous prime is 1995661853. The next prime is 1995661867. The reversal of 1995661854 is 4581665991.

1995661854 is a `hidden beast` number, since 19 + 9 + 5 + 6 + 618 + 5 + 4 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a self number, because there is not a number n which added to its sum of digits gives 1995661854.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1995661853) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 241804 + ... + 249920.

It is an arithmetic number, because the mean of its divisors is an integer number (72148725).

Almost surely, 2^1995661854 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1995661854, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2308759200).

1995661854 is an abundant number, since it is smaller than the sum of its proper divisors (2621856546).

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

1995661854 is a wasteful number, since it uses less digits than its factorization.

1995661854 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8314 (or 8308 counting only the distinct ones).

The product of its digits is 2332800, while the sum is 54.

The square root of 1995661854 is about 44672.8312736052. The cubic root of 1995661854 is about 1259.0094368813.

It can be divided in two parts, 19956 and 61854, that added together give a triangular number (81810 = T₄₀₄).

The spelling of 1995661854 in words is "one billion, nine hundred ninety-five million, six hundred sixty-one thousand, eight hundred fifty-four".