61000120000 has 140 divisors (see below), whose sum is σ = 151677553896. Its totient is φ = 24332800000.

The previous prime is 61000119979. The next prime is 61000120007. The reversal of 61000120000 is 2100016.

It is a Harshad number since it is a multiple of its sum of digits (10).

It is not an unprimeable number, because it can be changed into a prime (61000120007) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 16038099 + ... + 16041901.

Almost surely, 2^61000120000 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 61000120000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (75838776948).

61000120000 is an abundant number, since it is smaller than the sum of its proper divisors (90677433896).

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

61000120000 is an equidigital number, since it uses as much as digits as its factorization.

61000120000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4236 (or 4211 counting only the distinct ones).

The product of its (nonzero) digits is 12, while the sum is 10.

Adding to 61000120000 its reverse (2100016), we get a palindrome (61002220016).

The spelling of 61000120000 in words is "sixty-one billion, one hundred twenty thousand".