647769395073 has 4 divisors (see below), whose sum is σ = 863692526768. Its totient is φ = 431846263380.

The previous prime is 647769394973. The next prime is 647769395101. The reversal of 647769395073 is 370593967746.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 647769395073 - 2¹³ = 647769386881 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 647769394995 and 647769395013.

It is not an unprimeable number, because it can be changed into a prime (647769395573) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 107961565843 + ... + 107961565848.

It is an arithmetic number, because the mean of its divisors is an integer number (215923131692).

Almost surely, 2^647769395073 is an apocalyptic number.

It is an amenable number.

647769395073 is a deficient number, since it is larger than the sum of its proper divisors (215923131695).

647769395073 is a wasteful number, since it uses less digits than its factorization.

647769395073 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 215923131694.

The product of its (nonzero) digits is 180033840, while the sum is 66.

The spelling of 647769395073 in words is "six hundred forty-seven billion, seven hundred sixty-nine million, three hundred ninety-five thousand, seventy-three".