61899406848 has 200 divisors, whose sum is σ = 187519361832. Its totient is φ = 20324265984.

The previous prime is 61899406847. The next prime is 61899406867. The reversal of 61899406848 is 84860499816.

61899406848 is a `hidden beast` number, since 6 + 189 + 9 + 406 + 8 + 48 = 666.

It is a Smith number, since the sum of its digits (63) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61899406841) 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, 2767486 + ... + 2789762.

Almost surely, 2^61899406848 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 61899406848, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (93759680916).

61899406848 is an abundant number, since it is smaller than the sum of its proper divisors (125619954984).

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

61899406848 is an equidigital number, since it uses as much as digits as its factorization.

61899406848 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22374 (or 22349 counting only the distinct ones).

The product of its (nonzero) digits is 23887872, while the sum is 63.

The spelling of 61899406848 in words is "sixty-one billion, eight hundred ninety-nine million, four hundred six thousand, eight hundred forty-eight".