61551165235231 has 64 divisors (see below), whose sum is σ = 77299398696960. Its totient is φ = 47793943572480.

The previous prime is 61551165235171. The next prime is 61551165235303. The reversal of 61551165235231 is 13253256115516.

It is not a de Polignac number, because 61551165235231 - 2¹¹ = 61551165233183 is a prime.

It is a super-2 number, since 2×61551165235231² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61551165235831) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (31) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 2669278780 + ... + 2669301838.

It is an arithmetic number, because the mean of its divisors is an integer number (1207803104640).

Almost surely, 2^{61551165235231} is an apocalyptic number.

61551165235231 is a deficient number, since it is larger than the sum of its proper divisors (15748233461729).

61551165235231 is a wasteful number, since it uses less digits than its factorization.

61551165235231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26984.

The product of its digits is 810000, while the sum is 46.

The spelling of 61551165235231 in words is "sixty-one trillion, five hundred fifty-one billion, one hundred sixty-five million, two hundred thirty-five thousand, two hundred thirty-one".