61670457378 has 64 divisors (see below), whose sum is σ = 139177163520. Its totient is φ = 20238097536.

The previous prime is 61670457341. The next prime is 61670457389. The reversal of 61670457378 is 87375407616.

61670457378 is a `hidden beast` number, since 6 + 1 + 67 + 0 + 4 + 573 + 7 + 8 = 666.

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

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2181651 + ... + 2209737.

It is an arithmetic number, because the mean of its divisors is an integer number (2174643180).

Almost surely, 2^61670457378 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 61670457378, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (69588581760).

61670457378 is an abundant number, since it is smaller than the sum of its proper divisors (77506706142).

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

61670457378 is a wasteful number, since it uses less digits than its factorization.

61670457378 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28728 (or 28722 counting only the distinct ones).

The product of its (nonzero) digits is 5927040, while the sum is 54.

The spelling of 61670457378 in words is "sixty-one billion, six hundred seventy million, four hundred fifty-seven thousand, three hundred seventy-eight".