61680812457 has 32 divisors (see below), whose sum is σ = 91878589440. Its totient is φ = 36483289920.

The previous prime is 61680812449. The next prime is 61680812489. The reversal of 61680812457 is 75421808616.

61680812457 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 61680812457 - 2³ = 61680812449 is a prime.

It is a Smith number, since the sum of its digits (48) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (61680812057) 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, 1795044 + ... + 1829082.

It is an arithmetic number, because the mean of its divisors is an integer number (2871205920).

Almost surely, 2^61680812457 is an apocalyptic number.

It is an amenable number.

61680812457 is a deficient number, since it is larger than the sum of its proper divisors (30197776983).

61680812457 is a wasteful number, since it uses less digits than its factorization.

61680812457 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35373.

The product of its (nonzero) digits is 645120, while the sum is 48.

The spelling of 61680812457 in words is "sixty-one billion, six hundred eighty million, eight hundred twelve thousand, four hundred fifty-seven".