191945629457 has 8 divisors (see below), whose sum is σ = 194763614184. Its totient is φ = 189147282688.

The previous prime is 191945629433. The next prime is 191945629501. The reversal of 191945629457 is 754926549191.

It is a Cunningham number, because it is equal to 438116²+1.

It can be written as a sum of positive squares in 4 ways, for example, as 1 + 191945629456 = 1^2 + 438116^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 191945629457 - 2⁸ = 191945629201 is a prime.

It is a super-2 number, since 2×191945629457² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 191945629457.

It is not an unprimeable number, because it can be changed into a prime (191945629957) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4889798 + ... + 4928895.

It is an arithmetic number, because the mean of its divisors is an integer number (24345451773).

Almost surely, 2^191945629457 is an apocalyptic number.

It is an amenable number.

191945629457 is a deficient number, since it is larger than the sum of its proper divisors (2817984727).

191945629457 is a wasteful number, since it uses less digits than its factorization.

191945629457 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9818979.

The product of its digits is 24494400, while the sum is 62.

The spelling of 191945629457 in words is "one hundred ninety-one billion, nine hundred forty-five million, six hundred twenty-nine thousand, four hundred fifty-seven".