61123636507 has 2 divisors, whose sum is σ = 61123636508. Its totient is φ = 61123636506.

The previous prime is 61123636439. The next prime is 61123636529. The reversal of 61123636507 is 70563632116.

61123636507 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 61123636507 - 2¹¹ = 61123634459 is a prime.

It is a super-2 number, since 2×61123636507² (a number of 22 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 61123636507.

It is not a weakly prime, because it can be changed into another prime (61123636597) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30561818253 + 30561818254.

It is an arithmetic number, because the mean of its divisors is an integer number (30561818254).

Almost surely, 2^61123636507 is an apocalyptic number.

61123636507 is a deficient number, since it is larger than the sum of its proper divisors (1).

61123636507 is an equidigital number, since it uses as much as digits as its factorization.

61123636507 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 136080, while the sum is 40.

The spelling of 61123636507 in words is "sixty-one billion, one hundred twenty-three million, six hundred thirty-six thousand, five hundred seven".