61511118401 has 2 divisors, whose sum is σ = 61511118402. Its totient is φ = 61511118400.

The previous prime is 61511118371. The next prime is 61511118413. The reversal of 61511118401 is 10481111516.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 53047302400 + 8463816001 = 230320^2 + 91999^2 .

It is a cyclic number.

It is not a de Polignac number, because 61511118401 - 2¹⁴ = 61511102017 is a prime.

It is not a weakly prime, because it can be changed into another prime (61511118481) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30755559200 + 30755559201.

It is an arithmetic number, because the mean of its divisors is an integer number (30755559201).

Almost surely, 2^61511118401 is an apocalyptic number.

It is an amenable number.

61511118401 is a deficient number, since it is larger than the sum of its proper divisors (1).

61511118401 is an equidigital number, since it uses as much as digits as its factorization.

61511118401 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 960, while the sum is 29.

Adding to 61511118401 its reverse (10481111516), we get a palindrome (71992229917).

The spelling of 61511118401 in words is "sixty-one billion, five hundred eleven million, one hundred eighteen thousand, four hundred one".