61216406512 has 20 divisors (see below), whose sum is σ = 118671060816. Its totient is φ = 30591616640.

The previous prime is 61216406477. The next prime is 61216406519. The reversal of 61216406512 is 21560461216.

It is a super-2 number, since 2×61216406512² (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 (61216406519) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1006189 + ... + 1065292.

Almost surely, 2^61216406512 is an apocalyptic number.

It is an amenable number.

61216406512 is a deficient number, since it is larger than the sum of its proper divisors (57454654304).

61216406512 is a wasteful number, since it uses less digits than its factorization.

61216406512 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2073336 (or 2073330 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 34.

Adding to 61216406512 its reverse (21560461216), we get a palindrome (82776867728).

The spelling of 61216406512 in words is "sixty-one billion, two hundred sixteen million, four hundred six thousand, five hundred twelve".