642025761378 has 16 divisors (see below), whose sum is σ = 1295414811936. Its totient is φ = 212114705600.

The previous prime is 642025761373. The next prime is 642025761439. The reversal of 642025761378 is 873167520246.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 642025761378.

It is not an unprimeable number, because it can be changed into a prime (642025761373) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 473469648 + ... + 473471003.

It is an arithmetic number, because the mean of its divisors is an integer number (80963425746).

Almost surely, 2^642025761378 is an apocalyptic number.

642025761378 is an abundant number, since it is smaller than the sum of its proper divisors (653389050558).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

642025761378 is a wasteful number, since it uses less digits than its factorization.

642025761378 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 946940769.

The product of its (nonzero) digits is 3386880, while the sum is 51.

The spelling of 642025761378 in words is "six hundred forty-two billion, twenty-five million, seven hundred sixty-one thousand, three hundred seventy-eight".