61197205440 has 336 divisors, whose sum is σ = 227772065664. Its totient is φ = 13879756800.

The previous prime is 61197205379. The next prime is 61197205453. The reversal of 61197205440 is 4450279116.

It is a tau number, because it is divible by the number of its divisors (336).

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, 6157275 + ... + 6167205.

Almost surely, 2^61197205440 is an apocalyptic number.

61197205440 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 61197205440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (113886032832).

61197205440 is an abundant number, since it is smaller than the sum of its proper divisors (166574860224).

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

61197205440 is a wasteful number, since it uses less digits than its factorization.

61197205440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10096 (or 10079 counting only the distinct ones).

The product of its (nonzero) digits is 60480, while the sum is 39.

The spelling of 61197205440 in words is "sixty-one billion, one hundred ninety-seven million, two hundred five thousand, four hundred forty".