61898311080 has 320 divisors, whose sum is σ = 216186537600. Its totient is φ = 15931157760.

The previous prime is 61898311061. The next prime is 61898311081. The reversal of 61898311080 is 8011389816.

61898311080 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is not an unprimeable number, because it can be changed into a prime (61898311081) by changing a digit.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 22830925 + ... + 22833635.

It is an arithmetic number, because the mean of its divisors is an integer number (675582930).

Almost surely, 2^61898311080 is an apocalyptic number.

61898311080 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 61898311080, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (108093268800).

61898311080 is an abundant number, since it is smaller than the sum of its proper divisors (154288226520).

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

61898311080 is an equidigital number, since it uses as much as digits as its factorization.

61898311080 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2778 (or 2750 counting only the distinct ones).

The product of its (nonzero) digits is 82944, while the sum is 45.

The spelling of 61898311080 in words is "sixty-one billion, eight hundred ninety-eight million, three hundred eleven thousand, eighty".