61378716924 has 144 divisors (see below), whose sum is σ = 188248838400. Its totient is φ = 17239455072.

The previous prime is 61378716887. The next prime is 61378716929. The reversal of 61378716924 is 42961787316.

61378716924 is a `hidden beast` number, since 613 + 7 + 8 + 7 + 16 + 9 + 2 + 4 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61378716929) 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, 213937 + ... + 410519.

It is an arithmetic number, because the mean of its divisors is an integer number (1307283600).

Almost surely, 2^61378716924 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 61378716924, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (94124419200).

61378716924 is an abundant number, since it is smaller than the sum of its proper divisors (126870121476).

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

61378716924 is a wasteful number, since it uses less digits than its factorization.

61378716924 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 196669 (or 196654 counting only the distinct ones).

The product of its digits is 3048192, while the sum is 54.

The spelling of 61378716924 in words is "sixty-one billion, three hundred seventy-eight million, seven hundred sixteen thousand, nine hundred twenty-four".