61511145242 has 4 divisors (see below), whose sum is σ = 92266717866. Its totient is φ = 30755572620.

The previous prime is 61511145233. The next prime is 61511145247. The reversal of 61511145242 is 24254111516.

It is a happy number.

61511145242 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It can be written as a sum of positive squares in only one way, i.e., 60359153761 + 1151991481 = 245681^2 + 33941^2 .

It is a junction number, because it is equal to n+sod(n) for n = 61511145199 and 61511145208.

It is not an unprimeable number, because it can be changed into a prime (61511145247) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15377786309 + ... + 15377786312.

Almost surely, 2^61511145242 is an apocalyptic number.

61511145242 is a deficient number, since it is larger than the sum of its proper divisors (30755572624).

61511145242 is a wasteful number, since it uses less digits than its factorization.

61511145242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30755572623.

The product of its digits is 9600, while the sum is 32.

Adding to 61511145242 its reverse (24254111516), we get a palindrome (85765256758).

The spelling of 61511145242 in words is "sixty-one billion, five hundred eleven million, one hundred forty-five thousand, two hundred forty-two".