193902097645 has 4 divisors (see below), whose sum is σ = 232682517180. Its totient is φ = 155121678112.

The previous prime is 193902097639. The next prime is 193902097651. The reversal of 193902097645 is 546790209391.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (193902097639) and next prime (193902097651).

It can be written as a sum of positive squares in 2 ways, for example, as 148295078281 + 45607019364 = 385091^2 + 213558^2 .

It is a cyclic number.

It is not a de Polignac number, because 193902097645 - 2⁹ = 193902097133 is a prime.

It is a super-3 number, since 3×193902097645³ (a number of 35 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19390209760 + ... + 19390209769.

It is an arithmetic number, because the mean of its divisors is an integer number (58170629295).

Almost surely, 2^193902097645 is an apocalyptic number.

It is an amenable number.

193902097645 is a deficient number, since it is larger than the sum of its proper divisors (38780419535).

193902097645 is an equidigital number, since it uses as much as digits as its factorization.

193902097645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38780419534.

The product of its (nonzero) digits is 3674160, while the sum is 55.

The spelling of 193902097645 in words is "one hundred ninety-three billion, nine hundred two million, ninety-seven thousand, six hundred forty-five".