648252029881 has 9 divisors (see below), whose sum is σ = 650872005669. Its totient is φ = 645642567900.

The previous prime is 648252029837. The next prime is 648252029947. The reversal of 648252029881 is 188920252846.

The square root of 648252029881 is 805141.

It is a perfect power (a square), and thus also a powerful number.

It is not a de Polignac number, because 648252029881 - 2³⁷ = 510813076409 is a prime.

It is a super-2 number, since 2×648252029881² (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 (648252029081) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 218191726 + ... + 218194696.

It is an arithmetic number, because the mean of its divisors is an integer number (72319111741).

Almost surely, 2^648252029881 is an apocalyptic number.

648252029881 is the 805141-st square number.

648252029881 is the 402571-st centered octagonal number.

It is an amenable number.

648252029881 is a deficient number, since it is larger than the sum of its proper divisors (2619975788).

648252029881 is an frugal number, since it uses more digits than its factorization.

648252029881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6484 (or 3242 counting only the distinct ones).

The product of its (nonzero) digits is 4423680, while the sum is 55.

The spelling of 648252029881 in words is "six hundred forty-eight billion, two hundred fifty-two million, twenty-nine thousand, eight hundred eighty-one".