61455556133 has 2 divisors, whose sum is σ = 61455556134. Its totient is φ = 61455556132.

The previous prime is 61455556051. The next prime is 61455556147. The reversal of 61455556133 is 33165555416.

It is a happy number.

61455556133 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 can be written as a sum of positive squares in only one way, i.e., 61433588164 + 21967969 = 247858^2 + 4687^2 .

It is a cyclic number.

It is not a de Polignac number, because 61455556133 - 2²⁶ = 61388447269 is a prime.

It is a super-3 number, since 3×61455556133³ (a number of 33 digits) contains 333 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61455556193) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30727778066 + 30727778067.

It is an arithmetic number, because the mean of its divisors is an integer number (30727778067).

Almost surely, 2^61455556133 is an apocalyptic number.

It is an amenable number.

61455556133 is a deficient number, since it is larger than the sum of its proper divisors (1).

61455556133 is an equidigital number, since it uses as much as digits as its factorization.

61455556133 is an evil number, because the sum of its binary digits is even.

The product of its digits is 810000, while the sum is 44.

The spelling of 61455556133 in words is "sixty-one billion, four hundred fifty-five million, five hundred fifty-six thousand, one hundred thirty-three".