61123634513 has 2 divisors, whose sum is σ = 61123634514. Its totient is φ = 61123634512.

The previous prime is 61123634503. The next prime is 61123634603. The reversal of 61123634513 is 31543632116.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 59212895569 + 1910738944 = 243337^2 + 43712^2 .

It is a cyclic number.

It is not a de Polignac number, because 61123634513 - 2⁴ = 61123634497 is a prime.

It is not a weakly prime, because it can be changed into another prime (61123634503) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30561817256 + 30561817257.

It is an arithmetic number, because the mean of its divisors is an integer number (30561817257).

Almost surely, 2^61123634513 is an apocalyptic number.

It is an amenable number.

61123634513 is a deficient number, since it is larger than the sum of its proper divisors (1).

61123634513 is an equidigital number, since it uses as much as digits as its factorization.

61123634513 is an evil number, because the sum of its binary digits is even.

The product of its digits is 38880, while the sum is 35.

The spelling of 61123634513 in words is "sixty-one billion, one hundred twenty-three million, six hundred thirty-four thousand, five hundred thirteen".