161624551201 has 2 divisors, whose sum is σ = 161624551202. Its totient is φ = 161624551200.

The previous prime is 161624551189. The next prime is 161624551217. The reversal of 161624551201 is 102155426161.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 85296123025 + 76328428176 = 292055^2 + 276276^2 .

It is a cyclic number.

It is not a de Polignac number, because 161624551201 - 2⁷ = 161624551073 is a prime.

It is a super-2 number, since 2×161624551201² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (161624551241) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80812275600 + 80812275601.

It is an arithmetic number, because the mean of its divisors is an integer number (80812275601).

Almost surely, 2^161624551201 is an apocalyptic number.

It is an amenable number.

161624551201 is a deficient number, since it is larger than the sum of its proper divisors (1).

161624551201 is an equidigital number, since it uses as much as digits as its factorization.

161624551201 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 14400, while the sum is 34.

Adding to 161624551201 its reverse (102155426161), we get a palindrome (263779977362).

The spelling of 161624551201 in words is "one hundred sixty-one billion, six hundred twenty-four million, five hundred fifty-one thousand, two hundred one".