61164302557 has 2 divisors, whose sum is σ = 61164302558. Its totient is φ = 61164302556.

The previous prime is 61164302543. The next prime is 61164302581. The reversal of 61164302557 is 75520346116.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 54152082436 + 7012220121 = 232706^2 + 83739^2 .

It is a cyclic number.

It is not a de Polignac number, because 61164302557 - 2⁷ = 61164302429 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61164302357) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30582151278 + 30582151279.

It is an arithmetic number, because the mean of its divisors is an integer number (30582151279).

Almost surely, 2^61164302557 is an apocalyptic number.

It is an amenable number.

61164302557 is a deficient number, since it is larger than the sum of its proper divisors (1).

61164302557 is an equidigital number, since it uses as much as digits as its factorization.

61164302557 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 151200, while the sum is 40.

The spelling of 61164302557 in words is "sixty-one billion, one hundred sixty-four million, three hundred two thousand, five hundred fifty-seven".