671742542385 has 24 divisors (see below), whose sum is σ = 1214977817664. Its totient is φ = 342686050080.

The previous prime is 671742542381. The next prime is 671742542423. The reversal of 671742542385 is 583245247176.

671742542385 is a `hidden beast` number, since 6 + 7 + 1 + 7 + 4 + 254 + 2 + 385 = 666.

671742542385 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 671742542385 - 2² = 671742542381 is a prime.

It is not an unprimeable number, because it can be changed into a prime (671742542381) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 324512271 + ... + 324514340.

It is an arithmetic number, because the mean of its divisors is an integer number (50624075736).

Almost surely, 2^671742542385 is an apocalyptic number.

It is an amenable number.

671742542385 is a deficient number, since it is larger than the sum of its proper divisors (543235275279).

671742542385 is a wasteful number, since it uses less digits than its factorization.

671742542385 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 649026645 (or 649026642 counting only the distinct ones).

The product of its digits is 11289600, while the sum is 54.

The spelling of 671742542385 in words is "six hundred seventy-one billion, seven hundred forty-two million, five hundred forty-two thousand, three hundred eighty-five".