61555722241 has 12 divisors (see below), whose sum is σ = 67295023572. Its totient is φ = 55972543968.

The previous prime is 61555722233. The next prime is 61555722251. The reversal of 61555722241 is 14222755516.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 3539774016 + 58015948225 = 59496^2 + 240865^2 .

It is not a de Polignac number, because 61555722241 - 2³ = 61555722233 is a prime.

It is a super-3 number, since 3×61555722241³ (a number of 33 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 61555722194 and 61555722203.

It is not an unprimeable number, because it can be changed into a prime (61555722251) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 469050 + ... + 585763.

It is an arithmetic number, because the mean of its divisors is an integer number (5607918631).

Almost surely, 2^61555722241 is an apocalyptic number.

It is an amenable number.

61555722241 is a deficient number, since it is larger than the sum of its proper divisors (5739301331).

61555722241 is a wasteful number, since it uses less digits than its factorization.

61555722241 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1054960 (or 1054893 counting only the distinct ones).

The product of its digits is 168000, while the sum is 40.

The spelling of 61555722241 in words is "sixty-one billion, five hundred fifty-five million, seven hundred twenty-two thousand, two hundred forty-one".