612104991861 has 24 divisors (see below), whose sum is σ = 912284261280. Its totient is φ = 364685036320.

The previous prime is 612104991851. The next prime is 612104991929. The reversal of 612104991861 is 168199401216.

It is not a de Polignac number, because 612104991861 - 2³¹ = 609957508213 is a prime.

It is a super-2 number, since 2×612104991861² (a number of 24 digits) contains 22 as substring.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 612104991861.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (612104991811) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 14268750 + ... + 14311583.

It is an arithmetic number, because the mean of its divisors is an integer number (38011844220).

Almost surely, 2^612104991861 is an apocalyptic number.

It is an amenable number.

612104991861 is a deficient number, since it is larger than the sum of its proper divisors (300179269419).

612104991861 is a wasteful number, since it uses less digits than its factorization.

612104991861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28580417 (or 28580406 counting only the distinct ones).

The product of its (nonzero) digits is 186624, while the sum is 48.

The spelling of 612104991861 in words is "six hundred twelve billion, one hundred four million, nine hundred ninety-one thousand, eight hundred sixty-one".