121257162557 has 8 divisors (see below), whose sum is σ = 123298875480. Its totient is φ = 119217188160.

The previous prime is 121257162541. The next prime is 121257162569. The reversal of 121257162557 is 755261752121.

It can be written as a sum of positive squares in 4 ways, for example, as 3148780996 + 118108381561 = 56114^2 + 343669^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 121257162557 - 2⁴ = 121257162541 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121257164557) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 293582 + ... + 573327.

It is an arithmetic number, because the mean of its divisors is an integer number (15412359435).

Almost surely, 2^121257162557 is an apocalyptic number.

It is an amenable number.

121257162557 is a deficient number, since it is larger than the sum of its proper divisors (2041712923).

121257162557 is an equidigital number, since it uses as much as digits as its factorization.

121257162557 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 869263.

The product of its digits is 294000, while the sum is 44.

The spelling of 121257162557 in words is "one hundred twenty-one billion, two hundred fifty-seven million, one hundred sixty-two thousand, five hundred fifty-seven".