1648818700991 has 32 divisors (see below), whose sum is σ = 2064249546240. Its totient is φ = 1279436860800.

The previous prime is 1648818700897. The next prime is 1648818700999. The reversal of 1648818700991 is 1990078188461.

It is not a de Polignac number, because 1648818700991 - 2¹⁰ = 1648818699967 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1648818700999) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 39672500 + ... + 39714038.

It is an arithmetic number, because the mean of its divisors is an integer number (64507798320).

Almost surely, 2^{1648818700991} is an apocalyptic number.

1648818700991 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1648818700991 is a deficient number, since it is larger than the sum of its proper divisors (415430845249).

1648818700991 is a wasteful number, since it uses less digits than its factorization.

1648818700991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43695.

The product of its (nonzero) digits is 6967296, while the sum is 62.

The spelling of 1648818700991 in words is "one trillion, six hundred forty-eight billion, eight hundred eighteen million, seven hundred thousand, nine hundred ninety-one".