61578452329 has 2 divisors, whose sum is σ = 61578452330. Its totient is φ = 61578452328.

The previous prime is 61578452291. The next prime is 61578452407. The reversal of 61578452329 is 92325487516.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 59610199104 + 1968253225 = 244152^2 + 44365^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61578452329 is a prime.

It is not a weakly prime, because it can be changed into another prime (61578452729) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30789226164 + 30789226165.

It is an arithmetic number, because the mean of its divisors is an integer number (30789226165).

Almost surely, 2^61578452329 is an apocalyptic number.

It is an amenable number.

61578452329 is a deficient number, since it is larger than the sum of its proper divisors (1).

61578452329 is an equidigital number, since it uses as much as digits as its factorization.

61578452329 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3628800, while the sum is 52.

The spelling of 61578452329 in words is "sixty-one billion, five hundred seventy-eight million, four hundred fifty-two thousand, three hundred twenty-nine".