61631240443 has 4 divisors (see below), whose sum is σ = 64874989960. Its totient is φ = 58387490928.

The previous prime is 61631240393. The next prime is 61631240459. The reversal of 61631240443 is 34404213616.

61631240443 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 61631240443 - 2⁹ = 61631239931 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 61631240399 and 61631240408.

It is not an unprimeable number, because it can be changed into a prime (61631244443) 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, 1621874730 + ... + 1621874767.

It is an arithmetic number, because the mean of its divisors is an integer number (16218747490).

Almost surely, 2^61631240443 is an apocalyptic number.

61631240443 is a deficient number, since it is larger than the sum of its proper divisors (3243749517).

61631240443 is a wasteful number, since it uses less digits than its factorization.

61631240443 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3243749516.

The product of its (nonzero) digits is 41472, while the sum is 34.

The spelling of 61631240443 in words is "sixty-one billion, six hundred thirty-one million, two hundred forty thousand, four hundred forty-three".