61571378448 has 40 divisors (see below), whose sum is σ = 176732661600. Its totient is φ = 20523792672.

The previous prime is 61571378443. The next prime is 61571378461. The reversal of 61571378448 is 84487317516.

61571378448 is a `hidden beast` number, since 61 + 5 + 7 + 137 + 8 + 448 = 666.

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

It is a junction number, because it is equal to n+sod(n) for n = 61571378394 and 61571378403.

It is not an unprimeable number, because it can be changed into a prime (61571378443) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 71262738 + ... + 71263601.

It is an arithmetic number, because the mean of its divisors is an integer number (4418316540).

Almost surely, 2^61571378448 is an apocalyptic number.

It is an amenable number.

61571378448 is an abundant number, since it is smaller than the sum of its proper divisors (115161283152).

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

61571378448 is a wasteful number, since it uses less digits than its factorization.

61571378448 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 142526356 (or 142526344 counting only the distinct ones).

The product of its digits is 4515840, while the sum is 54.

The spelling of 61571378448 in words is "sixty-one billion, five hundred seventy-one million, three hundred seventy-eight thousand, four hundred forty-eight".