647137747775 has 6 divisors (see below), whose sum is σ = 802450807272. Its totient is φ = 517710198200.

The previous prime is 647137747769. The next prime is 647137747801. The reversal of 647137747775 is 577747731746.

It is a happy number.

It is not a de Polignac number, because 647137747775 - 2¹⁰ = 647137746751 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 12942754931 + ... + 12942754980.

It is an arithmetic number, because the mean of its divisors is an integer number (133741801212).

Almost surely, 2^647137747775 is an apocalyptic number.

647137747775 is a deficient number, since it is larger than the sum of its proper divisors (155313059497).

647137747775 is a wasteful number, since it uses less digits than its factorization.

647137747775 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25885509921 (or 25885509916 counting only the distinct ones).

The product of its digits is 169414560, while the sum is 65.

The spelling of 647137747775 in words is "six hundred forty-seven billion, one hundred thirty-seven million, seven hundred forty-seven thousand, seven hundred seventy-five".