647221029769 has 4 divisors (see below), whose sum is σ = 649681946496. Its totient is φ = 644760113044.

The previous prime is 647221029757. The next prime is 647221029803. The reversal of 647221029769 is 967920122746.

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 a cyclic number.

It is not a de Polignac number, because 647221029769 - 2¹⁷ = 647220898697 is a prime.

It is a super-2 number, since 2×647221029769² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (647221027769) 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, 1230457969 + ... + 1230458494.

It is an arithmetic number, because the mean of its divisors is an integer number (162420486624).

Almost surely, 2^647221029769 is an apocalyptic number.

It is an amenable number.

647221029769 is a deficient number, since it is larger than the sum of its proper divisors (2460916727).

647221029769 is a wasteful number, since it uses less digits than its factorization.

647221029769 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2460916726.

The product of its (nonzero) digits is 4572288, while the sum is 55.

The spelling of 647221029769 in words is "six hundred forty-seven billion, two hundred twenty-one million, twenty-nine thousand, seven hundred sixty-nine".