61765911619 has 2 divisors, whose sum is σ = 61765911620. Its totient is φ = 61765911618.

The previous prime is 61765911593. The next prime is 61765911671. The reversal of 61765911619 is 91611956716.

It is an a-pointer prime, because the next prime (61765911671) can be obtained adding 61765911619 to its sum of digits (52).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 61765911619 - 2³¹ = 59618427971 is a prime.

It is a super-2 number, since 2×61765911619² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (61765911019) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30882955809 + 30882955810.

It is an arithmetic number, because the mean of its divisors is an integer number (30882955810).

Almost surely, 2^61765911619 is an apocalyptic number.

61765911619 is a deficient number, since it is larger than the sum of its proper divisors (1).

61765911619 is an equidigital number, since it uses as much as digits as its factorization.

61765911619 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 612360, while the sum is 52.

The spelling of 61765911619 in words is "sixty-one billion, seven hundred sixty-five million, nine hundred eleven thousand, six hundred nineteen".