61671324557 has 2 divisors, whose sum is σ = 61671324558. Its totient is φ = 61671324556.

The previous prime is 61671324529. The next prime is 61671324601. The reversal of 61671324557 is 75542317616.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 54877279081 + 6794045476 = 234259^2 + 82426^2 .

It is a cyclic number.

It is not a de Polignac number, because 61671324557 - 2⁶ = 61671324493 is a prime.

It is a super-2 number, since 2×61671324557² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61671324157) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30835662278 + 30835662279.

It is an arithmetic number, because the mean of its divisors is an integer number (30835662279).

Almost surely, 2^61671324557 is an apocalyptic number.

It is an amenable number.

61671324557 is a deficient number, since it is larger than the sum of its proper divisors (1).

61671324557 is an equidigital number, since it uses as much as digits as its factorization.

61671324557 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1058400, while the sum is 47.

The spelling of 61671324557 in words is "sixty-one billion, six hundred seventy-one million, three hundred twenty-four thousand, five hundred fifty-seven".