1657385137601 has 4 divisors (see below), whose sum is σ = 1662134092500. Its totient is φ = 1652636182704.

The previous prime is 1657385137591. The next prime is 1657385137609. The reversal of 1657385137601 is 1067315837561.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 478032577201 + 1179352560400 = 691399^2 + 1085980^2 .

It is a cyclic number.

It is not a de Polignac number, because 1657385137601 - 2¹⁰ = 1657385136577 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1657385137609) 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, 2374476926 + ... + 2374477623.

It is an arithmetic number, because the mean of its divisors is an integer number (415533523125).

Almost surely, 2^{1657385137601} is an apocalyptic number.

It is an amenable number.

1657385137601 is a deficient number, since it is larger than the sum of its proper divisors (4748954899).

1657385137601 is an equidigital number, since it uses as much as digits as its factorization.

1657385137601 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4748954898.

The product of its (nonzero) digits is 3175200, while the sum is 53.

The spelling of 1657385137601 in words is "one trillion, six hundred fifty-seven billion, three hundred eighty-five million, one hundred thirty-seven thousand, six hundred one".