61451645013 has 24 divisors (see below), whose sum is σ = 97192910880. Its totient is φ = 37104953760.

The previous prime is 61451645011. The next prime is 61451645063. The reversal of 61451645013 is 31054615416.

61451645013 is a `hidden beast` number, since 6 + 1 + 4 + 5 + 1 + 645 + 0 + 1 + 3 = 666.

It is not a de Polignac number, because 61451645013 - 2¹ = 61451645011 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61451645011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1127131 + ... + 1180392.

It is an arithmetic number, because the mean of its divisors is an integer number (4049704620).

Almost surely, 2^61451645013 is an apocalyptic number.

It is an amenable number.

61451645013 is a deficient number, since it is larger than the sum of its proper divisors (35741265867).

61451645013 is a wasteful number, since it uses less digits than its factorization.

61451645013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2307809 (or 2307806 counting only the distinct ones).

The product of its (nonzero) digits is 43200, while the sum is 36.

The spelling of 61451645013 in words is "sixty-one billion, four hundred fifty-one million, six hundred forty-five thousand, thirteen".