61006155331 has 4 divisors (see below), whose sum is σ = 66552169464. Its totient is φ = 55460141200.

The previous prime is 61006155323. The next prime is 61006155337. The reversal of 61006155331 is 13355160016.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 61006155331 - 2³ = 61006155323 is a prime.

It is a super-2 number, since 2×61006155331² (a number of 22 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a junction number, because it is equal to n+sod(n) for n = 61006155293 and 61006155302.

It is not an unprimeable number, because it can be changed into a prime (61006155337) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2773007050 + ... + 2773007071.

It is an arithmetic number, because the mean of its divisors is an integer number (16638042366).

Almost surely, 2^61006155331 is an apocalyptic number.

61006155331 is a deficient number, since it is larger than the sum of its proper divisors (5546014133).

61006155331 is a wasteful number, since it uses less digits than its factorization.

61006155331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5546014132.

The product of its (nonzero) digits is 8100, while the sum is 31.

The spelling of 61006155331 in words is "sixty-one billion, six million, one hundred fifty-five thousand, three hundred thirty-one".