642251376000 has 1536 divisors, whose sum is σ = 2702239488000. Its totient is φ = 149448499200.

The previous prime is 642251375999. The next prime is 642251376061. The reversal of 642251376000 is 673152246.

642251376000 is a `hidden beast` number, since 6 + 42 + 2 + 5 + 1 + 3 + 7 + 600 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 1387151769 + ... + 1387152231.

It is an arithmetic number, because the mean of its divisors is an integer number (1759270500).

Almost surely, 2^642251376000 is an apocalyptic number.

642251376000 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 642251376000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1351119744000).

642251376000 is an abundant number, since it is smaller than the sum of its proper divisors (2059988112000).

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

642251376000 is a wasteful number, since it uses less digits than its factorization.

642251376000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 546 (or 505 counting only the distinct ones).

The product of its (nonzero) digits is 60480, while the sum is 36.

The spelling of 642251376000 in words is "six hundred forty-two billion, two hundred fifty-one million, three hundred seventy-six thousand".