61364868166640 has 160 divisors (see below), whose sum is σ = 146019573006336. Its totient is φ = 23977152783360.

The previous prime is 61364868166639. The next prime is 61364868166643. The reversal of 61364868166640 is 4666186846316.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61364868166643) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 535913234 + ... + 536027726.

Almost surely, 2^{61364868166640} 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 61364868166640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (73009786503168).

61364868166640 is an abundant number, since it is smaller than the sum of its proper divisors (84654704839696).

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

61364868166640 is a wasteful number, since it uses less digits than its factorization.

61364868166640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 115447 (or 115441 counting only the distinct ones).

The product of its (nonzero) digits is 143327232, while the sum is 65.

The spelling of 61364868166640 in words is "sixty-one trillion, three hundred sixty-four billion, eight hundred sixty-eight million, one hundred sixty-six thousand, six hundred forty".