61253551687 has 4 divisors (see below), whose sum is σ = 61254048240. Its totient is φ = 61253055136.

The previous prime is 61253551661. The next prime is 61253551691. The reversal of 61253551687 is 78615535216.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 61253551687 - 2¹⁵ = 61253518919 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 61253551687.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61253551657) 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 3 ways as a sum of consecutive naturals, for example, 94614 + ... + 362572.

It is an arithmetic number, because the mean of its divisors is an integer number (15313512060).

Almost surely, 2^61253551687 is an apocalyptic number.

61253551687 is a deficient number, since it is larger than the sum of its proper divisors (496553).

61253551687 is a wasteful number, since it uses less digits than its factorization.

61253551687 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 496552.

The product of its digits is 1512000, while the sum is 49.

The spelling of 61253551687 in words is "sixty-one billion, two hundred fifty-three million, five hundred fifty-one thousand, six hundred eighty-seven".