61216041213 has 12 divisors (see below), whose sum is σ = 89234393820. Its totient is φ = 40436283456.

The previous prime is 61216041197. The next prime is 61216041223. The reversal of 61216041213 is 31214061216.

It is a happy number.

61216041213 is a `hidden beast` number, since 612 + 1 + 6 + 0 + 41 + 2 + 1 + 3 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 30899311524 + 30316729689 = 175782^2 + 174117^2 .

It is not a de Polignac number, because 61216041213 - 2⁴ = 61216041197 is a prime.

It is a super-2 number, since 2×61216041213² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61216041223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 31199856 + ... + 31201817.

It is an arithmetic number, because the mean of its divisors is an integer number (7436199485).

Almost surely, 2^61216041213 is an apocalyptic number.

It is an amenable number.

61216041213 is a deficient number, since it is larger than the sum of its proper divisors (28018352607).

61216041213 is a wasteful number, since it uses less digits than its factorization.

61216041213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62401788 (or 62401785 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 27.

The spelling of 61216041213 in words is "sixty-one billion, two hundred sixteen million, forty-one thousand, two hundred thirteen".