61091901360 has 240 divisors, whose sum is σ = 235353418560. Its totient is φ = 13911644160.

The previous prime is 61091901287. The next prime is 61091901361. The reversal of 61091901360 is 6310919016.

61091901360 is a `hidden beast` number, since 6 + 109 + 190 + 1 + 360 = 666.

It is a tau number, because it is divible by the number of its divisors (240).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (61091901361) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1333230 + ... + 1378290.

It is an arithmetic number, because the mean of its divisors is an integer number (980639244).

Almost surely, 2^61091901360 is an apocalyptic number.

61091901360 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 61091901360, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (117676709280).

61091901360 is an abundant number, since it is smaller than the sum of its proper divisors (174261517200).

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

61091901360 is a wasteful number, since it uses less digits than its factorization.

61091901360 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45356 (or 45347 counting only the distinct ones).

The product of its (nonzero) digits is 8748, while the sum is 36.

The spelling of 61091901360 in words is "sixty-one billion, ninety-one million, nine hundred one thousand, three hundred sixty".