61781726355 has 8 divisors (see below), whose sum is σ = 98850762192. Its totient is φ = 32950254048.

The previous prime is 61781726339. The next prime is 61781726359. The reversal of 61781726355 is 55362718716.

61781726355 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 61781726355 - 2⁴ = 61781726339 is a prime.

It is a super-2 number, since 2×61781726355² (a number of 22 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 61781726298 and 61781726307.

It is not an unprimeable number, because it can be changed into a prime (61781726359) 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, 2059390864 + ... + 2059390893.

It is an arithmetic number, because the mean of its divisors is an integer number (12356345274).

Almost surely, 2^61781726355 is an apocalyptic number.

61781726355 is a deficient number, since it is larger than the sum of its proper divisors (37069035837).

61781726355 is a wasteful number, since it uses less digits than its factorization.

61781726355 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4118781765.

The product of its digits is 2116800, while the sum is 51.

The spelling of 61781726355 in words is "sixty-one billion, seven hundred eighty-one million, seven hundred twenty-six thousand, three hundred fifty-five".