61632370013 has 4 divisors (see below), whose sum is σ = 61732261020. Its totient is φ = 61532479008.

The previous prime is 61632370001. The next prime is 61632370073. The reversal of 61632370013 is 31007323616.

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 2202706489 + 59429663524 = 46933^2 + 243782^2 .

It is a cyclic number.

It is not a de Polignac number, because 61632370013 - 2²⁸ = 61363934557 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 (61632370073) 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, 49944578 + ... + 49945811.

It is an arithmetic number, because the mean of its divisors is an integer number (15433065255).

Almost surely, 2^61632370013 is an apocalyptic number.

It is an amenable number.

61632370013 is a deficient number, since it is larger than the sum of its proper divisors (99891007).

61632370013 is an equidigital number, since it uses as much as digits as its factorization.

61632370013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 99891006.

The product of its (nonzero) digits is 13608, while the sum is 32.

Adding to 61632370013 its reverse (31007323616), we get a palindrome (92639693629).

The spelling of 61632370013 in words is "sixty-one billion, six hundred thirty-two million, three hundred seventy thousand, thirteen".