61516435645 has 32 divisors (see below), whose sum is σ = 86154140160. Its totient is φ = 41291976960.

The previous prime is 61516435633. The next prime is 61516435649. The reversal of 61516435645 is 54653461516.

It is a happy number.

61516435645 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 61516435645 - 2⁷ = 61516435517 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 61516435595 and 61516435604.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61516435649) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 776575 + ... + 852115.

It is an arithmetic number, because the mean of its divisors is an integer number (2692316880).

Almost surely, 2^61516435645 is an apocalyptic number.

It is an amenable number.

61516435645 is a deficient number, since it is larger than the sum of its proper divisors (24637704515).

61516435645 is a wasteful number, since it uses less digits than its factorization.

61516435645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76045.

The product of its digits is 1296000, while the sum is 46.

The spelling of 61516435645 in words is "sixty-one billion, five hundred sixteen million, four hundred thirty-five thousand, six hundred forty-five".