601511643541 has 4 divisors (see below), whose sum is σ = 601513408300. Its totient is φ = 601509878784.

The previous prime is 601511643517. The next prime is 601511643547. The reversal of 601511643541 is 145346115106.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 155760462225 + 445751181316 = 394665^2 + 667646^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-601511643541 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 601511643541.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (601511643547) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 190026 + ... + 1113163.

It is an arithmetic number, because the mean of its divisors is an integer number (150378352075).

Almost surely, 2^601511643541 is an apocalyptic number.

It is an amenable number.

601511643541 is a deficient number, since it is larger than the sum of its proper divisors (1764759).

601511643541 is a wasteful number, since it uses less digits than its factorization.

601511643541 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1764758.

The product of its (nonzero) digits is 43200, while the sum is 37.

Adding to 601511643541 its reverse (145346115106), we get a palindrome (746857758647).

The spelling of 601511643541 in words is "six hundred one billion, five hundred eleven million, six hundred forty-three thousand, five hundred forty-one".