642721435041 has 32 divisors (see below), whose sum is σ = 982928314368. Its totient is φ = 365941532160.

The previous prime is 642721435021. The next prime is 642721435049. The reversal of 642721435041 is 140534127246.

642721435041 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 642721435041 - 2¹¹ = 642721432993 is a prime.

It is a super-2 number, since 2×642721435041² (a number of 24 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (642721435049) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 19588936 + ... + 19621718.

It is an arithmetic number, because the mean of its divisors is an integer number (30716509824).

Almost surely, 2^642721435041 is an apocalyptic number.

It is an amenable number.

642721435041 is a deficient number, since it is larger than the sum of its proper divisors (340206879327).

642721435041 is a wasteful number, since it uses less digits than its factorization.

642721435041 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36141.

The product of its (nonzero) digits is 161280, while the sum is 39.

The spelling of 642721435041 in words is "six hundred forty-two billion, seven hundred twenty-one million, four hundred thirty-five thousand, forty-one".