642366777 has 16 divisors (see below), whose sum is σ = 976631040. Its totient is φ = 372049152.

The previous prime is 642366773. The next prime is 642366827. The reversal of 642366777 is 777663246.

It is not a de Polignac number, because 642366777 - 2² = 642366773 is a prime.

It is not an unprimeable number, because it can be changed into a prime (642366773) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 483777 + ... + 485102.

It is an arithmetic number, because the mean of its divisors is an integer number (61039440).

Almost surely, 2^642366777 is an apocalyptic number.

It is an amenable number.

642366777 is a deficient number, since it is larger than the sum of its proper divisors (334264263).

642366777 is a wasteful number, since it uses less digits than its factorization.

642366777 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 968912.

The product of its digits is 1778112, while the sum is 48.

The square root of 642366777 is about 25344.9556519636. The cubic root of 642366777 is about 862.8348747114.

The spelling of 642366777 in words is "six hundred forty-two million, three hundred sixty-six thousand, seven hundred seventy-seven".