73738812661 has 2 divisors, whose sum is σ = 73738812662. Its totient is φ = 73738812660.

The previous prime is 73738812593. The next prime is 73738812673. The reversal of 73738812661 is 16621883737.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 42717035761 + 31021776900 = 206681^2 + 176130^2 .

It is a cyclic number.

It is not a de Polignac number, because 73738812661 - 2¹⁵ = 73738779893 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 73738812599 and 73738812608.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (73738813661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36869406330 + 36869406331.

It is an arithmetic number, because the mean of its divisors is an integer number (36869406331).

Almost surely, 2^73738812661 is an apocalyptic number.

It is an amenable number.

73738812661 is a deficient number, since it is larger than the sum of its proper divisors (1).

73738812661 is an equidigital number, since it uses as much as digits as its factorization.

73738812661 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2032128, while the sum is 52.

The spelling of 73738812661 in words is "seventy-three billion, seven hundred thirty-eight million, eight hundred twelve thousand, six hundred sixty-one".