61561840288235 has 48 divisors (see below), whose sum is σ = 86626698890400. Its totient is φ = 41875353967104.

The previous prime is 61561840288231. The next prime is 61561840288237. The reversal of 61561840288235 is 53288204816516.

It is not a de Polignac number, because 61561840288235 - 2² = 61561840288231 is a prime.

It is not an unprimeable number, because it can be changed into a prime (61561840288231) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 16220609 + ... + 19652781.

It is an arithmetic number, because the mean of its divisors is an integer number (1804722893550).

Almost surely, 2^{61561840288235} is an apocalyptic number.

61561840288235 is a deficient number, since it is larger than the sum of its proper divisors (25064858602165).

61561840288235 is a wasteful number, since it uses less digits than its factorization.

61561840288235 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3432780 (or 3432773 counting only the distinct ones).

The product of its (nonzero) digits is 22118400, while the sum is 59.

The spelling of 61561840288235 in words is "sixty-one trillion, five hundred sixty-one billion, eight hundred forty million, two hundred eighty-eight thousand, two hundred thirty-five".