61737134809 has 4 divisors (see below), whose sum is σ = 70556725504. Its totient is φ = 52917544116.

The previous prime is 61737134759. The next prime is 61737134917. The reversal of 61737134809 is 90843173716.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 61737134809 - 2⁹ = 61737134297 is a prime.

It is a super-2 number, since 2×61737134809² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61737134009) 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 in 3 ways as a sum of consecutive naturals, for example, 4409795337 + ... + 4409795350.

It is an arithmetic number, because the mean of its divisors is an integer number (17639181376).

Almost surely, 2^61737134809 is an apocalyptic number.

It is an amenable number.

61737134809 is a deficient number, since it is larger than the sum of its proper divisors (8819590695).

61737134809 is an equidigital number, since it uses as much as digits as its factorization.

61737134809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8819590694.

The product of its (nonzero) digits is 762048, while the sum is 49.

The spelling of 61737134809 in words is "sixty-one billion, seven hundred thirty-seven million, one hundred thirty-four thousand, eight hundred nine".