61522399309 has 4 divisors (see below), whose sum is σ = 70311313504. Its totient is φ = 52733485116.

The previous prime is 61522399297. The next prime is 61522399319. The reversal of 61522399309 is 90399322516.

It is a happy number.

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 a de Polignac number, because none of the positive numbers 2^k-61522399309 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 (61522399319) 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, 4394457087 + ... + 4394457100.

It is an arithmetic number, because the mean of its divisors is an integer number (17577828376).

Almost surely, 2^61522399309 is an apocalyptic number.

It is an amenable number.

61522399309 is a deficient number, since it is larger than the sum of its proper divisors (8788914195).

61522399309 is an equidigital number, since it uses as much as digits as its factorization.

61522399309 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8788914194.

The product of its (nonzero) digits is 787320, while the sum is 49.

The spelling of 61522399309 in words is "sixty-one billion, five hundred twenty-two million, three hundred ninety-nine thousand, three hundred nine".