61631240445 has 32 divisors (see below), whose sum is σ = 116011751040. Its totient is φ = 30936464640.

The previous prime is 61631240393. The next prime is 61631240459. The reversal of 61631240445 is 54404213616.

61631240445 is a `hidden beast` number, since 6 + 163 + 12 + 40 + 445 = 666.

61631240445 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 61631240445 - 2¹⁰ = 61631239421 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 13424991 + ... + 13429580.

It is an arithmetic number, because the mean of its divisors is an integer number (3625367220).

Almost surely, 2^61631240445 is an apocalyptic number.

It is an amenable number.

61631240445 is a deficient number, since it is larger than the sum of its proper divisors (54380510595).

61631240445 is a wasteful number, since it uses less digits than its factorization.

61631240445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26854602 (or 26854596 counting only the distinct ones).

The product of its (nonzero) digits is 69120, while the sum is 36.

The spelling of 61631240445 in words is "sixty-one billion, six hundred thirty-one million, two hundred forty thousand, four hundred forty-five".