611221220040 has 64 divisors (see below), whose sum is σ = 1847661140160. Its totient is φ = 161748104960.

The previous prime is 611221220017. The next prime is 611221220047. The reversal of 611221220040 is 40022122116.

It is a junction number, because it is equal to n+sod(n) for n = 611221219989 and 611221220016.

It is not an unprimeable number, because it can be changed into a prime (611221220047) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19425159 + ... + 19456598.

It is an arithmetic number, because the mean of its divisors is an integer number (28869705315).

Almost surely, 2^611221220040 is an apocalyptic number.

611221220040 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

611221220040 is an abundant number, since it is smaller than the sum of its proper divisors (1236439920120).

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

611221220040 is a wasteful number, since it uses less digits than its factorization.

611221220040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38881902 (or 38881898 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 21.

Adding to 611221220040 its reverse (40022122116), we get a palindrome (651243342156).

The spelling of 611221220040 in words is "six hundred eleven billion, two hundred twenty-one million, two hundred twenty thousand, forty".