671553534787 has 4 divisors (see below), whose sum is σ = 687932889336. Its totient is φ = 655174180240.

The previous prime is 671553534767. The next prime is 671553534797. The reversal of 671553534787 is 787435355176.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-671553534787 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (671553534767) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8189677213 + ... + 8189677294.

It is an arithmetic number, because the mean of its divisors is an integer number (171983222334).

Almost surely, 2^671553534787 is an apocalyptic number.

671553534787 is a deficient number, since it is larger than the sum of its proper divisors (16379354549).

671553534787 is a wasteful number, since it uses less digits than its factorization.

671553534787 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16379354548.

The product of its digits is 74088000, while the sum is 61.

The spelling of 671553534787 in words is "six hundred seventy-one billion, five hundred fifty-three million, five hundred thirty-four thousand, seven hundred eighty-seven".