645601361041 has 16 divisors (see below), whose sum is σ = 795031138944. Its totient is φ = 510519498624.

The previous prime is 645601361029. The next prime is 645601361087. The reversal of 645601361041 is 140163106546.

645601361041 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 645601361041 - 2⁷ = 645601360913 is a prime.

It is a super-2 number, since 2×645601361041² (a number of 24 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (645601361341) 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, 1822420 + ... + 2147653.

It is an arithmetic number, because the mean of its divisors is an integer number (49689446184).

Almost surely, 2^645601361041 is an apocalyptic number.

It is an amenable number.

645601361041 is a deficient number, since it is larger than the sum of its proper divisors (149429777903).

645601361041 is a wasteful number, since it uses less digits than its factorization.

645601361041 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3971880.

The product of its (nonzero) digits is 51840, while the sum is 37.

Adding to 645601361041 its reverse (140163106546), we get a palindrome (785764467587).

The spelling of 645601361041 in words is "six hundred forty-five billion, six hundred one million, three hundred sixty-one thousand, forty-one".