194261407488 has 144 divisors (see below), whose sum is σ = 577992835840. Its totient is φ = 64356166656.

The previous prime is 194261407471. The next prime is 194261407513. The reversal of 194261407488 is 884704162491.

194261407488 is a `hidden beast` number, since 1 + 9 + 426 + 140 + 74 + 8 + 8 = 666.

It is a tau number, because it is divible by the number of its divisors (144).

It is a Smith number, since the sum of its digits (54) coincides with the sum of the digits of its prime factors.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1040445 + ... + 1212867.

Almost surely, 2^194261407488 is an apocalyptic number.

194261407488 is a gapful number since it is divisible by the number (18) 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 194261407488, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (288996417920).

194261407488 is an abundant number, since it is smaller than the sum of its proper divisors (383731428352).

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

194261407488 is a wasteful number, since it uses less digits than its factorization.

194261407488 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 172611 (or 172591 counting only the distinct ones).

The product of its (nonzero) digits is 3096576, while the sum is 54.

The spelling of 194261407488 in words is "one hundred ninety-four billion, two hundred sixty-one million, four hundred seven thousand, four hundred eighty-eight".