61280377761 has 16 divisors (see below), whose sum is σ = 81948905280. Its totient is φ = 40732779840.

The previous prime is 61280377759. The next prime is 61280377793. The reversal of 61280377761 is 16777308216.

It is not a de Polignac number, because 61280377761 - 2¹ = 61280377759 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 61280377761.

It is not an unprimeable number, because it can be changed into a prime (61280377721) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6641131 + ... + 6650351.

It is an arithmetic number, because the mean of its divisors is an integer number (5121806580).

Almost surely, 2^61280377761 is an apocalyptic number.

It is an amenable number.

61280377761 is a deficient number, since it is larger than the sum of its proper divisors (20668527519).

61280377761 is a wasteful number, since it uses less digits than its factorization.

61280377761 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15536.

The product of its (nonzero) digits is 592704, while the sum is 48.

The spelling of 61280377761 in words is "sixty-one billion, two hundred eighty million, three hundred seventy-seven thousand, seven hundred sixty-one".