611221216604 has 144 divisors (see below), whose sum is σ = 1239269129280. Its totient is φ = 262514165760.

The previous prime is 611221216603. The next prime is 611221216643. The reversal of 611221216604 is 406612122116.

It is a super-4 number, since 4×611221216604⁴ (a number of 48 digits) contains 4444 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (611221216601) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 517544894 + ... + 517546074.

It is an arithmetic number, because the mean of its divisors is an integer number (8606035620).

Almost surely, 2^611221216604 is an apocalyptic number.

It is an amenable number.

611221216604 is an abundant number, since it is smaller than the sum of its proper divisors (628047912676).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

611221216604 is a wasteful number, since it uses less digits than its factorization.

611221216604 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1996 (or 1975 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 32.

The spelling of 611221216604 in words is "six hundred eleven billion, two hundred twenty-one million, two hundred sixteen thousand, six hundred four".