1642664555 has 8 divisors (see below), whose sum is σ = 2252797152. Its totient is φ = 1126398528.

The previous prime is 1642664539. The next prime is 1642664557. The reversal of 1642664555 is 5554662461.

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

It is a cyclic number.

It is not a de Polignac number, because 1642664555 - 2⁴ = 1642664539 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1642664557) 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, 23466602 + ... + 23466671.

It is an arithmetic number, because the mean of its divisors is an integer number (281599644).

Almost surely, 2^1642664555 is an apocalyptic number.

1642664555 is a deficient number, since it is larger than the sum of its proper divisors (610132597).

1642664555 is an equidigital number, since it uses as much as digits as its factorization.

1642664555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46933285.

The product of its digits is 864000, while the sum is 44.

The square root of 1642664555 is about 40529.7983587385. The cubic root of 1642664555 is about 1179.9120290158.

The spelling of 1642664555 in words is "one billion, six hundred forty-two million, six hundred sixty-four thousand, five hundred fifty-five".