61277401637 has 2 divisors, whose sum is σ = 61277401638. Its totient is φ = 61277401636.

The previous prime is 61277401631. The next prime is 61277401649. The reversal of 61277401637 is 73610477216.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 45932633761 + 15344767876 = 214319^2 + 123874^2 .

It is a cyclic number.

It is not a de Polignac number, because 61277401637 - 2¹⁶ = 61277336101 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61277401631) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30638700818 + 30638700819.

It is an arithmetic number, because the mean of its divisors is an integer number (30638700819).

Almost surely, 2^61277401637 is an apocalyptic number.

It is an amenable number.

61277401637 is a deficient number, since it is larger than the sum of its proper divisors (1).

61277401637 is an equidigital number, since it uses as much as digits as its factorization.

61277401637 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 296352, while the sum is 44.

The spelling of 61277401637 in words is "sixty-one billion, two hundred seventy-seven million, four hundred one thousand, six hundred thirty-seven".