1642661948 has 12 divisors (see below), whose sum is σ = 3025956360. Its totient is φ = 778102992.

The previous prime is 1642661939. The next prime is 1642661959. The reversal of 1642661948 is 8491662461.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10806911 + ... + 10807062.

It is an arithmetic number, because the mean of its divisors is an integer number (252163030).

Almost surely, 2^1642661948 is an apocalyptic number.

It is an amenable number.

1642661948 is a deficient number, since it is larger than the sum of its proper divisors (1383294412).

1642661948 is a wasteful number, since it uses less digits than its factorization.

1642661948 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21613996 (or 21613994 counting only the distinct ones).

The product of its digits is 497664, while the sum is 47.

The square root of 1642661948 is about 40529.7661972038. The cubic root of 1642661948 is about 1179.9114048202.

The spelling of 1642661948 in words is "one billion, six hundred forty-two million, six hundred sixty-one thousand, nine hundred forty-eight".