61572336409 has 2 divisors, whose sum is σ = 61572336410. Its totient is φ = 61572336408.

The previous prime is 61572336401. The next prime is 61572336421. The reversal of 61572336409 is 90463327516.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 34446246409 + 27126090000 = 185597^2 + 164700^2 .

It is a cyclic number.

It is not a de Polignac number, because 61572336409 - 2³ = 61572336401 is a prime.

It is a super-2 number, since 2×61572336409² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (61572336401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30786168204 + 30786168205.

It is an arithmetic number, because the mean of its divisors is an integer number (30786168205).

Almost surely, 2^61572336409 is an apocalyptic number.

It is an amenable number.

61572336409 is a deficient number, since it is larger than the sum of its proper divisors (1).

61572336409 is an equidigital number, since it uses as much as digits as its factorization.

61572336409 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 816480, while the sum is 46.

The spelling of 61572336409 in words is "sixty-one billion, five hundred seventy-two million, three hundred thirty-six thousand, four hundred nine".