61640263808000 has 352 divisors, whose sum is σ = 156882078951936. Its totient is φ = 24161587200000.

The previous prime is 61640263807981. The next prime is 61640263808047. The reversal of 61640263808000 is 80836204616.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2115953435 + ... + 2115982565.

Almost surely, 2^{61640263808000} 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 61640263808000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (78441039475968).

61640263808000 is an abundant number, since it is smaller than the sum of its proper divisors (95241815143936).

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

61640263808000 is a wasteful number, since it uses less digits than its factorization.

61640263808000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29498 (or 29470 counting only the distinct ones).

The product of its (nonzero) digits is 331776, while the sum is 44.

The spelling of 61640263808000 in words is "sixty-one trillion, six hundred forty billion, two hundred sixty-three million, eight hundred eight thousand".