611564431541 has 4 divisors (see below), whose sum is σ = 698930778912. Its totient is φ = 524198084172.

The previous prime is 611564431463. The next prime is 611564431571. The reversal of 611564431541 is 145134465116.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 611564431541 - 2³⁸ = 336686524597 is a prime.

It is a super-2 number, since 2×611564431541² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (611564431571) 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, 43683173675 + ... + 43683173688.

It is an arithmetic number, because the mean of its divisors is an integer number (174732694728).

Almost surely, 2^611564431541 is an apocalyptic number.

It is an amenable number.

611564431541 is a deficient number, since it is larger than the sum of its proper divisors (87366347371).

611564431541 is an equidigital number, since it uses as much as digits as its factorization.

611564431541 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 87366347370.

The product of its digits is 172800, while the sum is 41.

Adding to 611564431541 its reverse (145134465116), we get a palindrome (756698896657).

The spelling of 611564431541 in words is "six hundred eleven billion, five hundred sixty-four million, four hundred thirty-one thousand, five hundred forty-one".