61897502100 has 144 divisors (see below), whose sum is σ = 204945910400. Its totient is φ = 14129233920.

The previous prime is 61897502087. The next prime is 61897502119. The reversal of 61897502100 is 120579816.

61897502100 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1595736 + ... + 1634064.

Almost surely, 2^61897502100 is an apocalyptic number.

61897502100 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 61897502100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (102472955200).

61897502100 is an abundant number, since it is smaller than the sum of its proper divisors (143048408300).

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

61897502100 is a wasteful number, since it uses less digits than its factorization.

61897502100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39122 (or 39115 counting only the distinct ones).

The product of its (nonzero) digits is 30240, while the sum is 39.

The spelling of 61897502100 in words is "sixty-one billion, eight hundred ninety-seven million, five hundred two thousand, one hundred".