61617520123 has 2 divisors, whose sum is σ = 61617520124. Its totient is φ = 61617520122.

The previous prime is 61617520039. The next prime is 61617520147. The reversal of 61617520123 is 32102571616.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 61617520123 - 2⁹ = 61617519611 is a prime.

It is a super-2 number, since 2×61617520123² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (61617520183) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30808760061 + 30808760062.

It is an arithmetic number, because the mean of its divisors is an integer number (30808760062).

Almost surely, 2^61617520123 is an apocalyptic number.

61617520123 is a deficient number, since it is larger than the sum of its proper divisors (1).

61617520123 is an equidigital number, since it uses as much as digits as its factorization.

61617520123 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 15120, while the sum is 34.

The spelling of 61617520123 in words is "sixty-one billion, six hundred seventeen million, five hundred twenty thousand, one hundred twenty-three".