647276472961 has 4 divisors (see below), whose sum is σ = 647430553924. Its totient is φ = 647122392000.

The previous prime is 647276472949. The next prime is 647276472967. The reversal of 647276472961 is 169274672746.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 169274672746 = 2 ⋅84637336373.

It can be written as a sum of positive squares in 2 ways, for example, as 54251726400 + 593024746561 = 232920^2 + 770081^2 .

It is a cyclic number.

It is not a de Polignac number, because 647276472961 - 2⁷ = 647276472833 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 647276472961.

It is not an unprimeable number, because it can be changed into a prime (647276472967) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 77034180 + ... + 77042581.

It is an arithmetic number, because the mean of its divisors is an integer number (161857638481).

Almost surely, 2^647276472961 is an apocalyptic number.

It is an amenable number.

647276472961 is a deficient number, since it is larger than the sum of its proper divisors (154080963).

647276472961 is a wasteful number, since it uses less digits than its factorization.

647276472961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 154080962.

The product of its digits is 42674688, while the sum is 61.

The spelling of 647276472961 in words is "six hundred forty-seven billion, two hundred seventy-six million, four hundred seventy-two thousand, nine hundred sixty-one".