642476101722 has 432 divisors, whose sum is σ = 1740318387552. Its totient is φ = 157541529600.

The previous prime is 642476101721. The next prime is 642476101763. The reversal of 642476101722 is 227101674246.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is not an unprimeable number, because it can be changed into a prime (642476101721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 215 ways as a sum of consecutive naturals, for example, 1450284433 + ... + 1450284875.

It is an arithmetic number, because the mean of its divisors is an integer number (4028514786).

Almost surely, 2^642476101722 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 642476101722, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (870159193776).

642476101722 is an abundant number, since it is smaller than the sum of its proper divisors (1097842285830).

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

642476101722 is a wasteful number, since it uses less digits than its factorization.

642476101722 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 623 (or 586 counting only the distinct ones).

The product of its (nonzero) digits is 225792, while the sum is 42.

Adding to 642476101722 its reverse (227101674246), we get a palindrome (869577775968).

The spelling of 642476101722 in words is "six hundred forty-two billion, four hundred seventy-six million, one hundred one thousand, seven hundred twenty-two".