1951194655872 has 1280 divisors, whose sum is σ = 7488327813120. Its totient is φ = 489661562880.

The previous prime is 1951194655661. The next prime is 1951194655873. The reversal of 1951194655872 is 2785564911591.

It is a happy number.

1951194655872 is a `hidden beast` number, since 1 + 9 + 5 + 1 + 1 + 9 + 4 + 6 + 558 + 72 = 666.

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

It is not an unprimeable number, because it can be changed into a prime (1951194655873) by changing a digit.

It is a polite number, since it can be written in 159 ways as a sum of consecutive naturals, for example, 3879114373 + ... + 3879114875.

It is an arithmetic number, because the mean of its divisors is an integer number (5850256104).

Almost surely, 2^{1951194655872} is an apocalyptic number.

1951194655872 is a gapful number since it is divisible by the number (12) 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 1951194655872, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3744163906560).

1951194655872 is an abundant number, since it is smaller than the sum of its proper divisors (5537133157248).

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

1951194655872 is a wasteful number, since it uses less digits than its factorization.

1951194655872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 703 (or 682 counting only the distinct ones).

The product of its digits is 27216000, while the sum is 63.

The spelling of 1951194655872 in words is "one trillion, nine hundred fifty-one billion, one hundred ninety-four million, six hundred fifty-five thousand, eight hundred seventy-two".