643642350056051 has 16 divisors (see below), whose sum is σ = 693340333713408. Its totient is φ = 595756586304000.

The previous prime is 643642350055997. The next prime is 643642350056059. The reversal of 643642350056051 is 150650053246346.

It is a cyclic number.

It is not a de Polignac number, because 643642350056051 - 2⁴⁶ = 573273605878387 is a prime.

It is a super-3 number, since 3×643642350056051³ (a number of 45 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (643642350056059) 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, 21074501 + ... + 41610326.

It is an arithmetic number, because the mean of its divisors is an integer number (43333770857088).

Almost surely, 2^{643642350056051} is an apocalyptic number.

643642350056051 is a deficient number, since it is larger than the sum of its proper divisors (49697983657357).

643642350056051 is a wasteful number, since it uses less digits than its factorization.

643642350056051 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62699282.

The product of its (nonzero) digits is 7776000, while the sum is 50.

The spelling of 643642350056051 in words is "six hundred forty-three trillion, six hundred forty-two billion, three hundred fifty million, fifty-six thousand, fifty-one".