61555152202261 has 16 divisors (see below), whose sum is σ = 62548982959680. Its totient is φ = 60569233079040.

The previous prime is 61555152202259. The next prime is 61555152202277. The reversal of 61555152202261 is 16220225155516.

It is a cyclic number.

It is not a de Polignac number, because 61555152202261 - 2¹ = 61555152202259 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 (61555152202241) 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, 555391231 + ... + 555502051.

It is an arithmetic number, because the mean of its divisors is an integer number (3909311434980).

Almost surely, 2^{61555152202261} is an apocalyptic number.

It is an amenable number.

61555152202261 is a deficient number, since it is larger than the sum of its proper divisors (993830757419).

61555152202261 is a wasteful number, since it uses less digits than its factorization.

61555152202261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 146436.

The product of its (nonzero) digits is 360000, while the sum is 43.

Adding to 61555152202261 its reverse (16220225155516), we get a palindrome (77775377357777).

The spelling of 61555152202261 in words is "sixty-one trillion, five hundred fifty-five billion, one hundred fifty-two million, two hundred two thousand, two hundred sixty-one".