642005564072 has 8 divisors (see below), whose sum is σ = 1203760432650. Its totient is φ = 321002782032.

The previous prime is 642005564059. The next prime is 642005564093. The reversal of 642005564072 is 270465500246.

642005564072 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 632257161316 + 9748402756 = 795146^2 + 98734^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-2 number, since 2×642005564072² (a number of 24 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40125347747 + ... + 40125347762.

Almost surely, 2^642005564072 is an apocalyptic number.

It is an amenable number.

642005564072 is a deficient number, since it is larger than the sum of its proper divisors (561754868578).

642005564072 is a wasteful number, since it uses less digits than its factorization.

642005564072 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80250695515 (or 80250695511 counting only the distinct ones).

The product of its (nonzero) digits is 403200, while the sum is 41.

The spelling of 642005564072 in words is "six hundred forty-two billion, five million, five hundred sixty-four thousand, seventy-two".