1642009555 has 4 divisors (see below), whose sum is σ = 1970411472. Its totient is φ = 1313607640.

The previous prime is 1642009547. The next prime is 1642009561. The reversal of 1642009555 is 5559002461.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5559002461 = 43 ⋅129279127.

It is not a de Polignac number, because 1642009555 - 2³ = 1642009547 is a prime.

It is a super-2 number, since 2×1642009555² = 5392390757422596050, which contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 164200951 + ... + 164200960.

It is an arithmetic number, because the mean of its divisors is an integer number (492602868).

Almost surely, 2^1642009555 is an apocalyptic number.

1642009555 is a deficient number, since it is larger than the sum of its proper divisors (328401917).

1642009555 is an equidigital number, since it uses as much as digits as its factorization.

1642009555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 328401916.

The product of its (nonzero) digits is 54000, while the sum is 37.

The square root of 1642009555 is about 40521.7170786234. The cubic root of 1642009555 is about 1179.7551811836.

It can be divided in two parts, 164200 and 9555, that added together give a triangular number (173755 = T₅₈₉).

The spelling of 1642009555 in words is "one billion, six hundred forty-two million, nine thousand, five hundred fifty-five".