61572222120 has 64 divisors (see below), whose sum is σ = 188201905920. Its totient is φ = 16109460224.

The previous prime is 61572222091. The next prime is 61572222121. The reversal of 61572222120 is 2122227516.

It is a super-2 number, since 2×61572222120² (a number of 22 digits) contains 22 as substring.

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

It is not an unprimeable number, because it can be changed into a prime (61572222121) 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, 4834224 + ... + 4846943.

It is an arithmetic number, because the mean of its divisors is an integer number (2940654780).

Almost surely, 2^61572222120 is an apocalyptic number.

61572222120 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

61572222120 is an abundant number, since it is smaller than the sum of its proper divisors (126629683800).

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

61572222120 is a wasteful number, since it uses less digits than its factorization.

61572222120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9681234 (or 9681230 counting only the distinct ones).

The product of its (nonzero) digits is 6720, while the sum is 30.

Adding to 61572222120 its reverse (2122227516), we get a palindrome (63694449636).

The spelling of 61572222120 in words is "sixty-one billion, five hundred seventy-two million, two hundred twenty-two thousand, one hundred twenty".