61631045220 has 24 divisors (see below), whose sum is σ = 172566926784. Its totient is φ = 16434945376.

The previous prime is 61631045159. The next prime is 61631045279. The reversal of 61631045220 is 2254013616.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 513591984 + ... + 513592103.

It is an arithmetic number, because the mean of its divisors is an integer number (7190288616).

Almost surely, 2^61631045220 is an apocalyptic number.

61631045220 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

61631045220 is an abundant number, since it is smaller than the sum of its proper divisors (110935881564).

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

61631045220 is a wasteful number, since it uses less digits than its factorization.

61631045220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1027184099 (or 1027184097 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 30.

Adding to 61631045220 its reverse (2254013616), we get a palindrome (63885058836).

The spelling of 61631045220 in words is "sixty-one billion, six hundred thirty-one million, forty-five thousand, two hundred twenty".