61211100620 has 48 divisors (see below), whose sum is σ = 130573029888. Its totient is φ = 24100009920.

The previous prime is 61211100619. The next prime is 61211100649. The reversal of 61211100620 is 2600111216.

It is a super-2 number, since 2×61211100620² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 61211100592 and 61211100601.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 381827 + ... + 517893.

It is an arithmetic number, because the mean of its divisors is an integer number (2720271456).

Almost surely, 2^61211100620 is an apocalyptic number.

It is an amenable number.

61211100620 is an abundant number, since it is smaller than the sum of its proper divisors (69361929268).

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

61211100620 is a wasteful number, since it uses less digits than its factorization.

61211100620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 136430 (or 136428 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 20.

Adding to 61211100620 its reverse (2600111216), we get a palindrome (63811211836).

The spelling of 61211100620 in words is "sixty-one billion, two hundred eleven million, one hundred thousand, six hundred twenty".