61299840517 has 4 divisors (see below), whose sum is σ = 61988602860. Its totient is φ = 60611078176.

The previous prime is 61299840509. The next prime is 61299840521. The reversal of 61299840517 is 71504899216.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 4136290596 + 57163549921 = 64314^2 + 239089^2 .

It is a cyclic number.

It is not a de Polignac number, because 61299840517 - 2³ = 61299840509 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61299840577) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 344381038 + ... + 344381215.

It is an arithmetic number, because the mean of its divisors is an integer number (15497150715).

Almost surely, 2^61299840517 is an apocalyptic number.

It is an amenable number.

61299840517 is a deficient number, since it is larger than the sum of its proper divisors (688762343).

61299840517 is an equidigital number, since it uses as much as digits as its factorization.

61299840517 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 688762342.

The product of its (nonzero) digits is 1088640, while the sum is 52.

The spelling of 61299840517 in words is "sixty-one billion, two hundred ninety-nine million, eight hundred forty thousand, five hundred seventeen".