642942511 has 8 divisors (see below), whose sum is σ = 665280000. Its totient is φ = 620704920.

The previous prime is 642942473. The next prime is 642942569. The reversal of 642942511 is 115249246.

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 642942511 - 2¹⁹ = 642418223 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642942581) 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, 11761 + ... + 37738.

It is an arithmetic number, because the mean of its divisors is an integer number (83160000).

Almost surely, 2^642942511 is an apocalyptic number.

642942511 is a deficient number, since it is larger than the sum of its proper divisors (22337489).

642942511 is a wasteful number, since it uses less digits than its factorization.

642942511 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49949.

The product of its digits is 17280, while the sum is 34.

The square root of 642942511 is about 25356.3110684500. The cubic root of 642942511 is about 863.0925753761.

The spelling of 642942511 in words is "six hundred forty-two million, nine hundred forty-two thousand, five hundred eleven".