61257555308067 has 4 divisors (see below), whose sum is σ = 81676740410760. Its totient is φ = 40838370205376.

The previous prime is 61257555308063. The next prime is 61257555308129. The reversal of 61257555308067 is 76080355575216.

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 61257555308067 - 2² = 61257555308063 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 61257555308067.

It is not an unprimeable number, because it can be changed into a prime (61257555308063) 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, 10209592551342 + ... + 10209592551347.

It is an arithmetic number, because the mean of its divisors is an integer number (20419185102690).

Almost surely, 2^{61257555308067} is an apocalyptic number.

61257555308067 is a deficient number, since it is larger than the sum of its proper divisors (20419185102693).

61257555308067 is a wasteful number, since it uses less digits than its factorization.

61257555308067 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20419185102692.

The product of its (nonzero) digits is 52920000, while the sum is 60.

The spelling of 61257555308067 in words is "sixty-one trillion, two hundred fifty-seven billion, five hundred fifty-five million, three hundred eight thousand, sixty-seven".