194840432640 has 1872 divisors, whose sum is σ = 881004563712. Its totient is φ = 41023438848.

The previous prime is 194840432629. The next prime is 194840432651. The reversal of 194840432640 is 46234048491.

It is an interprime number because it is at equal distance from previous prime (194840432629) and next prime (194840432651).

It is a super-3 number, since 3×194840432640³ (a number of 35 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 4145541097 + ... + 4145541143.

It is an arithmetic number, because the mean of its divisors is an integer number (470622096).

Almost surely, 2^194840432640 is an apocalyptic number.

194840432640 is a gapful number since it is divisible by the number (10) 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 194840432640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (440502281856).

194840432640 is an abundant number, since it is smaller than the sum of its proper divisors (686164131072).

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

194840432640 is an equidigital number, since it uses as much as digits as its factorization.

194840432640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 122 (or 81 counting only the distinct ones).

The product of its (nonzero) digits is 663552, while the sum is 45.

The spelling of 194840432640 in words is "one hundred ninety-four billion, eight hundred forty million, four hundred thirty-two thousand, six hundred forty".