57878757780491 has 2 divisors, whose sum is σ = 57878757780492. Its totient is φ = 57878757780490.

The previous prime is 57878757780433. The next prime is 57878757780499. The reversal of 57878757780491 is 19408775787875.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-57878757780491 is a prime.

It is not a weakly prime, because it can be changed into another prime (57878757780499) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28939378890245 + 28939378890246.

It is an arithmetic number, because the mean of its divisors is an integer number (28939378890246).

Almost surely, 2^{57878757780491} is an apocalyptic number.

57878757780491 is a deficient number, since it is larger than the sum of its proper divisors (1).

57878757780491 is an equidigital number, since it uses as much as digits as its factorization.

57878757780491 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7744665600, while the sum is 83.

The spelling of 57878757780491 in words is "fifty-seven trillion, eight hundred seventy-eight billion, seven hundred fifty-seven million, seven hundred eighty thousand, four hundred ninety-one".