61509203363 has 4 divisors (see below), whose sum is σ = 61511193840. Its totient is φ = 61507212888.

The previous prime is 61509203359. The next prime is 61509203383. The reversal of 61509203363 is 36330290516.

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

It is a cyclic number.

It is not a de Polignac number, because 61509203363 - 2² = 61509203359 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61509203383) 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, 948143 + ... + 1010936.

It is an arithmetic number, because the mean of its divisors is an integer number (15377798460).

Almost surely, 2^61509203363 is an apocalyptic number.

61509203363 is a deficient number, since it is larger than the sum of its proper divisors (1990477).

61509203363 is a wasteful number, since it uses less digits than its factorization.

61509203363 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1990476.

The product of its (nonzero) digits is 87480, while the sum is 38.

Adding to 61509203363 its reverse (36330290516), we get a palindrome (97839493879).

The spelling of 61509203363 in words is "sixty-one billion, five hundred nine million, two hundred three thousand, three hundred sixty-three".