1020111857957 has 2 divisors, whose sum is σ = 1020111857958. Its totient is φ = 1020111857956.

The previous prime is 1020111857939. The next prime is 1020111857987. The reversal of 1020111857957 is 7597581110201.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 879517606276 + 140594251681 = 937826^2 + 374959^2 .

It is a cyclic number.

It is not a de Polignac number, because 1020111857957 - 2¹⁸ = 1020111595813 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1020111857917) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 510055928978 + 510055928979.

It is an arithmetic number, because the mean of its divisors is an integer number (510055928979).

Almost surely, 2^{1020111857957} is an apocalyptic number.

It is an amenable number.

1020111857957 is a deficient number, since it is larger than the sum of its proper divisors (1).

1020111857957 is an equidigital number, since it uses as much as digits as its factorization.

1020111857957 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 176400, while the sum is 47.

The spelling of 1020111857957 in words is "one trillion, twenty billion, one hundred eleven million, eight hundred fifty-seven thousand, nine hundred fifty-seven".