648452977921 has 8 divisors (see below), whose sum is σ = 741094246080. Its totient is φ = 555812991888.

The previous prime is 648452977871. The next prime is 648452977943. The reversal of 648452977921 is 129779254846.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 648452977921 - 2¹⁷ = 648452846849 is a prime.

It is a super-2 number, since 2×648452977921² (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 (648452977961) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1329615 + ... + 1750651.

It is an arithmetic number, because the mean of its divisors is an integer number (92636780760).

Almost surely, 2^648452977921 is an apocalyptic number.

It is an amenable number.

648452977921 is a deficient number, since it is larger than the sum of its proper divisors (92641268159).

648452977921 is a wasteful number, since it uses less digits than its factorization.

648452977921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 641063.

The product of its digits is 60963840, while the sum is 64.

The spelling of 648452977921 in words is "six hundred forty-eight billion, four hundred fifty-two million, nine hundred seventy-seven thousand, nine hundred twenty-one".