647452271977 has 24 divisors (see below), whose sum is σ = 779204585160. Its totient is φ = 535771111680.

The previous prime is 647452271953. The next prime is 647452271987. The reversal of 647452271977 is 779172254746.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 182142016 + 647270129961 = 13496^2 + 804531^2 .

It is not a de Polignac number, because 647452271977 - 2²⁷ = 647318054249 is a prime.

It is a super-3 number, since 3×647452271977³ (a number of 36 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (647452271927) 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, 24253077 + ... + 24279757.

It is an arithmetic number, because the mean of its divisors is an integer number (32466857715).

Almost surely, 2^647452271977 is an apocalyptic number.

It is an amenable number.

647452271977 is a deficient number, since it is larger than the sum of its proper divisors (131752313183).

647452271977 is a wasteful number, since it uses less digits than its factorization.

647452271977 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43801 (or 43794 counting only the distinct ones).

The product of its digits is 41489280, while the sum is 61.

The spelling of 647452271977 in words is "six hundred forty-seven billion, four hundred fifty-two million, two hundred seventy-one thousand, nine hundred seventy-seven".