2191436854488 has 384 divisors, whose sum is σ = 7502521579200. Its totient is φ = 588916113408.

The previous prime is 2191436854469. The next prime is 2191436854553. The reversal of 2191436854488 is 8844586341912.

It is a happy number.

2191436854488 is a `hidden beast` number, since 2 + 1 + 9 + 1 + 4 + 3 + 6 + 8 + 544 + 88 = 666.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 387382156 + ... + 387387812.

Almost surely, 2^{2191436854488} is an apocalyptic number.

2191436854488 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2191436854488, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3751260789600).

2191436854488 is an abundant number, since it is smaller than the sum of its proper divisors (5311084724712).

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

2191436854488 is a wasteful number, since it uses less digits than its factorization.

2191436854488 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7856 (or 7839 counting only the distinct ones).

The product of its digits is 53084160, while the sum is 63.

The spelling of 2191436854488 in words is "two trillion, one hundred ninety-one billion, four hundred thirty-six million, eight hundred fifty-four thousand, four hundred eighty-eight".