61555343373640 has 32 divisors (see below), whose sum is σ = 139510468023480. Its totient is φ = 24442413716992.

The previous prime is 61555343373637. The next prime is 61555343373649. The reversal of 61555343373640 is 4637334355516.

It can be written as a sum of positive squares in 4 ways, for example, as 50542516174276 + 11012827199364 = 7109326^2 + 3318558^2 .

It is not an unprimeable number, because it can be changed into a prime (61555343373649) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5616357967 + ... + 5616368926.

Almost surely, 2^{61555343373640} is an apocalyptic number.

It is an amenable number.

61555343373640 is an abundant number, since it is smaller than the sum of its proper divisors (77955124649840).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

61555343373640 is a wasteful number, since it uses less digits than its factorization.

61555343373640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11232727041 (or 11232727037 counting only the distinct ones).

The product of its (nonzero) digits is 40824000, while the sum is 55.

The spelling of 61555343373640 in words is "sixty-one trillion, five hundred fifty-five billion, three hundred forty-three million, three hundred seventy-three thousand, six hundred forty".