61255177759 has 4 divisors (see below), whose sum is σ = 61290525816. Its totient is φ = 61219829704.

The previous prime is 61255177757. The next prime is 61255177769. The reversal of 61255177759 is 95777155216.

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 61255177759 - 2¹ = 61255177757 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61255177751) 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, 17671429 + ... + 17674894.

It is an arithmetic number, because the mean of its divisors is an integer number (15322631454).

Almost surely, 2^61255177759 is an apocalyptic number.

61255177759 is a deficient number, since it is larger than the sum of its proper divisors (35348057).

61255177759 is a wasteful number, since it uses less digits than its factorization.

61255177759 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35348056.

The product of its digits is 4630500, while the sum is 55.

The spelling of 61255177759 in words is "sixty-one billion, two hundred fifty-five million, one hundred seventy-seven thousand, seven hundred fifty-nine".