61316357840 has 80 divisors (see below), whose sum is σ = 144903582720. Its totient is φ = 24124531200.

The previous prime is 61316357827. The next prime is 61316357867. The reversal of 61316357840 is 4875361316.

It is a tau number, because it is divible by the number of its divisors (80).

It is a junction number, because it is equal to n+sod(n) for n = 61316357791 and 61316357800.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3749201 + ... + 3765519.

It is an arithmetic number, because the mean of its divisors is an integer number (1811294784).

Almost surely, 2^61316357840 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 61316357840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (72451791360).

61316357840 is an abundant number, since it is smaller than the sum of its proper divisors (83587224880).

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

61316357840 is a wasteful number, since it uses less digits than its factorization.

61316357840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17100 (or 17094 counting only the distinct ones).

The product of its (nonzero) digits is 362880, while the sum is 44.

The spelling of 61316357840 in words is "sixty-one billion, three hundred sixteen million, three hundred fifty-seven thousand, eight hundred forty".