1648021815 has 96 divisors (see below), whose sum is σ = 3241667520. Its totient is φ = 793774080.

The previous prime is 1648021787. The next prime is 1648021861. The reversal of 1648021815 is 5181208461.

1648021815 is a `hidden beast` number, since 1 + 648 + 0 + 2 + 1 + 8 + 1 + 5 = 666.

1648021815 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 1648021815 - 2⁶ = 1648021751 is a prime.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 1648021815.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 3805839 + ... + 3806271.

It is an arithmetic number, because the mean of its divisors is an integer number (33767370).

Almost surely, 2^1648021815 is an apocalyptic number.

1648021815 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1648021815 is a deficient number, since it is larger than the sum of its proper divisors (1593645705).

1648021815 is a wasteful number, since it uses less digits than its factorization.

1648021815 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 702 (or 685 counting only the distinct ones).

The product of its (nonzero) digits is 15360, while the sum is 36.

The square root of 1648021815 is about 40595.8349464573. The cubic root of 1648021815 is about 1181.1933285989.

The spelling of 1648021815 in words is "one billion, six hundred forty-eight million, twenty-one thousand, eight hundred fifteen".