11601601657 has 2 divisors, whose sum is σ = 11601601658. Its totient is φ = 11601601656.

The previous prime is 11601601621. The next prime is 11601601673. The reversal of 11601601657 is 75610610611.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6069812281 + 5531789376 = 77909^2 + 74376^2 .

It is an emirp because it is prime and its reverse (75610610611) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 11601601657 - 2¹⁵ = 11601568889 is a prime.

It is a super-2 number, since 2×11601601657² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (11601601357) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5800800828 + 5800800829.

It is an arithmetic number, because the mean of its divisors is an integer number (5800800829).

Almost surely, 2^11601601657 is an apocalyptic number.

It is an amenable number.

11601601657 is a deficient number, since it is larger than the sum of its proper divisors (1).

11601601657 is an equidigital number, since it uses as much as digits as its factorization.

11601601657 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7560, while the sum is 34.

The spelling of 11601601657 in words is "eleven billion, six hundred one million, six hundred one thousand, six hundred fifty-seven".