1057542787978 has 8 divisors (see below), whose sum is σ = 1588426453440. Its totient is φ = 528067303500.

The previous prime is 1057542787967. The next prime is 1057542787979. The reversal of 1057542787978 is 8797872457501.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×1057542787978² (a number of 25 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1057542787979) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 352043368 + ... + 352046371.

It is an arithmetic number, because the mean of its divisors is an integer number (198553306680).

Almost surely, 2^{1057542787978} is an apocalyptic number.

1057542787978 is a deficient number, since it is larger than the sum of its proper divisors (530883665462).

1057542787978 is an equidigital number, since it uses as much as digits as its factorization.

1057542787978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 704090492.

The product of its (nonzero) digits is 276595200, while the sum is 70.

The spelling of 1057542787978 in words is "one trillion, fifty-seven billion, five hundred forty-two million, seven hundred eighty-seven thousand, nine hundred seventy-eight".