642162851 has 12 divisors (see below), whose sum is σ = 709422000. Its totient is φ = 580829040.

The previous prime is 642162821. The next prime is 642162877. The reversal of 642162851 is 158261246.

It is not a de Polignac number, because 642162851 - 2¹⁰ = 642161827 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (642162821) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 10745 + ... + 37413.

It is an arithmetic number, because the mean of its divisors is an integer number (59118500).

Almost surely, 2^642162851 is an apocalyptic number.

642162851 is a deficient number, since it is larger than the sum of its proper divisors (67259149).

642162851 is a wasteful number, since it uses less digits than its factorization.

642162851 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26890 (or 26879 counting only the distinct ones).

The product of its digits is 23040, while the sum is 35.

The square root of 642162851 is about 25340.9323230224. The cubic root of 642162851 is about 862.7435597526.

The spelling of 642162851 in words is "six hundred forty-two million, one hundred sixty-two thousand, eight hundred fifty-one".