1617657461257 has 4 divisors (see below), whose sum is σ = 1617676314436. Its totient is φ = 1617638608080.

The previous prime is 1617657461221. The next prime is 1617657461269. The reversal of 1617657461257 is 7521647567161.

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 389851633161 + 1227805828096 = 624381^2 + 1108064^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1617657461257 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1617657471257) 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, 9297294 + ... + 9469687.

It is an arithmetic number, because the mean of its divisors is an integer number (404419078609).

Almost surely, 2^{1617657461257} is an apocalyptic number.

It is an amenable number.

1617657461257 is a deficient number, since it is larger than the sum of its proper divisors (18853179).

1617657461257 is an equidigital number, since it uses as much as digits as its factorization.

1617657461257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18853178.

The product of its digits is 14817600, while the sum is 58.

The spelling of 1617657461257 in words is "one trillion, six hundred seventeen billion, six hundred fifty-seven million, four hundred sixty-one thousand, two hundred fifty-seven".