385001965581 has 4 divisors (see below), whose sum is σ = 513335954112. Its totient is φ = 256667977052.

The previous prime is 385001965571. The next prime is 385001965609. The reversal of 385001965581 is 185569100583.

It is a happy number.

385001965581 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 385001965581 - 2⁹ = 385001965069 is a prime.

It is a super-2 number, since 2×385001965581² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (385001965501) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 64166994261 + ... + 64166994266.

It is an arithmetic number, because the mean of its divisors is an integer number (128333988528).

Almost surely, 2^385001965581 is an apocalyptic number.

It is an amenable number.

385001965581 is a deficient number, since it is larger than the sum of its proper divisors (128333988531).

385001965581 is a wasteful number, since it uses less digits than its factorization.

385001965581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128333988530.

The product of its (nonzero) digits is 1296000, while the sum is 51.

The spelling of 385001965581 in words is "three hundred eighty-five billion, one million, nine hundred sixty-five thousand, five hundred eighty-one".